Float switch or controller ยท Sump Alarm

Sump Alarm Piggyback Tethered Float Switch

A plug-in tethered float for most pumps

Updated October 2026

Quick verdict

A simple universal replacement.

Strength
Plug-in piggyback with a 13 A rating.
Trade-off
Tethered only.
Right buyer
Most sump pumps up to 1/2 HP.
Switch
Piggyback float switch
Voltage
120 V
Power source
Corded Electric
Dimensions (seller)
4.5"L x 3.25"W x 1.5"H
Product weight
12 ounces
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Why it matters

This float plugs in piggyback style between the outlet and the pump and switches pumps up to 1/2 HP or 13 A at 120 VAC. Its microswitch is rated for more than a million cycles, in a non-corrosive polypropylene float.

The tether is adjustable for light to medium suspended solids, and it shuts the pump off when the water drops to protect against burnout.

Who it's for, and who should skip it

Good fit if

  • Replacing a failed float
  • Pumps up to 1/2 HP
  • Sump and septic tanks

Look elsewhere if

  • Narrow pits
  • Pumps over 13 A

Pros and cons

Pros

  • Piggyback plug
  • 13 A rating
  • Adjustable tether

Cons

  • Needs room to swing
  • Lesser-known brand
  • Few install specs

Limitations to weigh

  • Check the switch's amp and horsepower rating against your pump's nameplate before plugging it in.
  • Piggyback switches plug into the outlet and the pump plugs into them; set the pump's own switch to manual or remove it, per the pump maker.
  • Check your pit diameter against the switch: vertical floats fit narrow pits, tethered floats need room to swing.

Specifications

Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.

MaterialPolypropylene (PP)Retailer
Dimensions (seller)4.5"L x 3.25"W x 1.5"HRetailer
Product weight12 ouncesRetailer
Voltage120 VRetailer
Model numberSA-3100-3-RAWRetailer
SwitchPiggyback float switchRetailer

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Final verdict

An easy piggyback replacement for most sump pumps.

Where to buy

Our links open this exact model's product page. Prices and stock change; check what's included before you order.

Prices change often; the button shows today's price.

Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure

Questions buyers ask

What pumps does it fit?
Most 120 V sump pumps up to 1/2 HP or 13 A.
Is the tether adjustable?
Yes.