Why it matters
The CDU790 draws water from the top, which keeps it from sucking up pit debris and prevents air lock, so no weep hole is needed. Wayne rates it at up to 4,600 GPH from 1/3 HP.
An integrated vertical float, rated for 1 million cycles, fits narrow pits. It has an epoxy-coated steel motor housing, stainless fasteners and a cast iron volute, and a three-year warranty.
Who it's for, and who should skip it
Good fit if
- Narrow sump pits
- Budget-minded owners
- DIY replacements
Look elsewhere if
- Sewage or toilet waste
- Draining pools or floors (a utility pump is cheaper)
- Homes that need a backup but have only one pump
Pros and cons
Pros
- Top suction
- Vertical float
- Low price
Cons
- 3-year warranty
- Steel motor housing
- Leaves water in the pit
Limitations to weigh
- Maximum head is where flow drops to zero; at your lift the pump moves less than its maximum flow. Size it with the sizing calculator.
- Fit a check valve on the discharge so water in the pipe doesn't fall back into the pit after each cycle.
- Use the sizing calculator with your lift and pipe run before choosing horsepower; bigger isn't better if it short-cycles.
Specifications
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Material | Cast Iron | Retailer |
|---|---|---|
| Dimensions (seller) | 9"L x 6.5"W x 11.5"H | Retailer |
| Product weight | 16.4 lb | Retailer |
| Max flow (maker) | 63 GPM | Retailer |
| Max head / lift (maker) | 20 ft | Retailer |
| Voltage | 120 V | Retailer |
| Model number | CDU790 | Retailer |
| Warranty | 3 Year Limited | Retailer |
| Horsepower | 1/3 HP | Retailer |
| Housing | stainless steel | Retailer |
Alternatives worth comparing
More sump pumps we cover
- Superior Pump 92341 Sump Pump
- Wayne CDU980E Sump Pump
- Red Lion RL-SC50V Sump Pump
- Superior Pump 92151 Sump Pump
All sump pumps, compared in one table · Every Wayne product we cover
Final verdict
The best-value 1/3 HP pump here.
Where to buy
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