Engineering Analysis: Liberty Pumps 257 257 1/3 HP Cast Iron Sump Pump
The Liberty Pumps 257 is an engineered residential pumping solution built around a high-efficiency motor housed in class 25 cast iron. In our hydraulic benchmarks, this unit achieves 2,040 GPH at 10 feet of Total Dynamic Head, operating well within standard residential basement parameters.
Actuation is controlled via an integrated vmf magnetically-coupled vertical float, engineered to prevent hang-ups against basin walls and switch fouling. The motor features permanent split-capacitor windings with automatic thermal-overload protection, preventing winding burn-out during sustained storm surges.
Plumbing integration utilizes a standard 1-1/2" NPT discharge collar. We recommend pairing this unit with a spring-loaded silent check valve to mitigate reverse hydraulic shock waves (water hammer) upon pump shut-off.
Discharge Flow Curve (GPH vs Head Height)
Pump flow capacity diminishes as Total Dynamic Head increases. Sourced from the official manufacturer hydraulic performance curve.
| Dynamic Head (ft) | Discharge Flow (GPH) | Flow Rate (GPM) | Rating Source |
|---|---|---|---|
| 0' | 2,880 GPH | 48.0 GPM | Manufacturer Technical Sheet |
| 5' | 2,502 GPH | 41.7 GPM | Manufacturer Technical Sheet |
| 10' | 2,040 GPH | 34.0 GPM | Manufacturer Technical Sheet |
| 15' | 1,122 GPH | 18.7 GPM | Manufacturer Technical Sheet |
| 20' | 408 GPH | 6.8 GPM | Manufacturer Technical Sheet |
Shut-off head (zero flow): 21.0 ft. Operating beyond 85% of shut-off head is not recommended due to motor overheating.
Basin & Plumbing Fit Check
Verify basin dimensions, discharge piping, and electrical receptacle requirements before installing the Liberty Pumps 257:
| Minimum Pit Diameter | 10" clear diameter recommended for proper switch cycle operation. |
|---|---|
| Discharge Pipe Diameter | 1-1/2" NPT Schedule 40 PVC recommended to minimize friction head loss. |
| Weep Hole Requirement | 3/16" air-bleed hole required between pump discharge and check valve to prevent air-locking. |
| Electrical Circuit | Dedicated 115V AC, 15A branch circuit protected by GFCI. |
Sourced Technical Specifications
Every engineering figure is tagged with its verification tier. Sourced from manufacturer technical sheets.
Manufacturer Technical SheetManufacturer Store SpecRetailer Verified SpecPumpendium Hydraulic Calc
Hydraulic Performance
| Flow @ 0' Head | 2,880 GPH | Manufacturer Technical Sheet |
|---|---|---|
| Flow @ 10' Head | 2,040 GPH | Manufacturer Technical Sheet |
| Shut-Off Head | 21.0 ft | Manufacturer Technical Sheet |
| Solids Handling | 1/2" Spherical | Manufacturer Technical Sheet |
Motor & Electrical
| Motor Rating | 1/3 HP | Manufacturer Technical Sheet |
|---|---|---|
| Voltage / Phase | 115V / 1-Phase / 60 Hz | Manufacturer Technical Sheet |
| Full Load Amps (FLA) | 6.8 A | Manufacturer Technical Sheet |
| Motor Type | Oil-Filled Hermetically Sealed | Manufacturer Technical Sheet |
Physical & Plumbing Dimensions
| Discharge Connection | 1-1/2" NPT | Manufacturer Technical Sheet |
|---|---|---|
| Housing Construction | Class 25 Cast Iron | Manufacturer Technical Sheet |
| Minimum Basin Diameter | 10" | Manufacturer Technical Sheet |
| Cord Length | 10 ft Heavy-Duty SJTW | Manufacturer Technical Sheet |
Engineering Limitations to Weigh
- Do not exceed maximum pumping lift of 17.8 feet to avoid continuous motor thermal tripping.
- Verify float switch clearance to prevent switch rod or tether binding against flexible basin liner ribs.
Head-to-Head Comparisons
Compare the Liberty Pumps 257 1/3 HP Cast Iron Sump Pump against its closest technical competitors:
- M53 Mighty-Mate 1/3 HP Submersible Sump Pump vs 257 1/3 HP Cast Iron Sump Pump
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs M53 1/3 HP Mighty-Mate Cast Iron Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs M57 1/3 HP Heavy Cast Iron Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (standard)
- 257 1/3 HP Cast Iron Sump Pump vs M63 1/3 HP Premium Sump Pump with LED Plug (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs N53 1/3 HP Manual Submersible Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs BN53 1/3 HP Tethered Float Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs D53 1/3 HP Double-Seal Submersible Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs M72 1/3 HP Submersible Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs CDU790 1/3 HP Cast Iron Submersible Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs SPF33 1/3 HP Thermoplastic Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs STF33 1/3 HP Cast Iron & Stainless Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (standard)
- 257 1/3 HP Cast Iron Sump Pump vs CSN33T 1/3 HP Cast Iron Sump Pump (Tethered) (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs SSN33 1/3 HP Stainless Steel Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 237 1/3 HP Cast Iron Sump Pump with VMF (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 230 1/3 HP Manual Cast Iron Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 250 1/3 HP Manual Cast Iron Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 233 1/3 HP Cast Iron Sump Pump (Wide-Angle) (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 253 1/3 HP Cast Iron Sump Pump (Wide-Angle) (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs S37 1/3 HP Stainless Steel Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs S38 1/3 HP All Stainless Steel Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 404 1/3 HP Compact Drain & Laundry Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (30ft)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs S33 1/3 HP Cast Iron Submersible Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (30ft)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs ME33 1/3 HP Commercial Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs D-A1 1/3 HP Hydromatic Diaphragm Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs V-A1 1/3 HP Hydromatic Vertical Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs SP33 1/3 HP Hydromatic Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 218 1/3 HP Hydromatic Heavy Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S1800A 1/3 HP Flotec Thermoplastic Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs FP0S3200A 1/3 HP Flotec Cast Iron Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 2825SS 1/3 HP Simer Stainless Steel Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIA 1/3 HP Cast Iron Sump Pump with Diaphragm Switch (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 6-CIM 1/3 HP Manual Cast Iron Sump Pump (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 92341 1/3 HP Cast Iron Sump Pump with Vertical Switch (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (10ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (15ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (25ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (20ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (35ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (50ft)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (standard)
- 257 1/3 HP Cast Iron Sump Pump vs 92330 1/3 HP Cast Iron Sump Pump (Tethered) (pro-kit)
- 257 1/3 HP Cast Iron Sump Pump vs 91330 1/3 HP Thermoplastic Sump Pump (10ft)
Frequently Asked Technical Questions
What is the actual discharge flow of the Liberty Pumps 257 at 10 feet of lift?
At 10 feet of Total Dynamic Head (standard 8-foot vertical wall lift plus pipe friction loss), the Liberty Pumps 257 delivers 2,040 GPH (approximately 34.0 GPM).
Can the Liberty Pumps 257 fit into a 12-inch sump basin?
The manufacturer specifies a minimum basin diameter of 10". Operating in narrower pits risks mechanical float hang-ups unless an electronic or vertical magnetic switch is utilized.
Does the Liberty Pumps 257 require a discharge weep hole?
Yes. A 3/16-inch weep hole must be drilled into the discharge pipe below the check valve inside the pit to purge trapped air and prevent hydraulic airlocks.
Technical Sources & Documentation
- Liberty Pumps Technical Specification Sheet & Performance Curve (257) — Liberty Pumps Engineering Technical Documentation (Retrieved 2026). View primary source
- Hydraulic Institute ANSI/HI 14.3 Sump Pump Testing & Rating Standards — Hydraulic Institute (Retrieved 2025). View primary source