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How to Replace a Sump Pump Check Valve

sump pump check valve

The check valve on a sump pump prevents water from flowing back into the pump once the unit has shut off. Check valves may need to be replaced from time to time, which is a simple maintenance task that can be completed in one hour or less.

You will need the following items to complete this project:

  • Sump pump replacement valve
  • Screwdriver
  • Hacksaw or PVC cutters
  • PVC coupling
  • PVC pipe
  • PVC cement
  • Utility knife

Follow these steps to replace the check valve on your sump pump:

Prepare the Sump Pump

Allow the sump pump to run until all water has been removed from the sump basin. Once complete, disconnect the power to the sump pump.

Remove the Old Check Valve

There are two styles of check valves on a sump pump: one that looks like a PVC coupling and the other that uses hose clamps to fasten to the PVC discharge pipe.

  • For the PVC coupling style check valve, use a hacksaw or PVC pipe cutters to cut above and below the valve to disconnect from the unit.
  • For the hose clamp valve style, loosen the hose clamps at the top and bottom to remove the old check valve.

Install the New Check Valve

Make sure the new check valve is not smaller than the discharge pipe on your sump pump. If it is, then you will need to install a PVC coupling to unite the larger pipe with the new check valve.

There should be an arrow on the new check valve that indicates which direction the water should flow. When you place the new check valve onto the sump pump, make sure the arrow is pointing toward the drain line and away from the sump pump.

Brace the Discharge Pipe

Add a brace to the discharge pipe so that it does not pull apart from the check valve.