How to Replace a Sump Pump Check Valve


Read your manual for installation, operation, and safety information. This guide neither supplements nor replaces the Owner’s Manual.

How to Replace a Sump Pump Check Valve
A sump pump check valve is located in your sump system’s discharge line. Its purpose is to prevent discharged water from flowing back into the basin when the pump motor turns OFF. Replacing a check valve should involve only an hour or so.

Cost (0-5 scale): 1
Difficulty (0-5 scale): 2

Items Needed:
• Replacement valve
• Screwdriver
• Hacksaw or PVC cutters
• PVC coupling
• PVC pipe
• PVC cement
• Utility knife

Step One – Safety and preparation
Insure that the sump basin is drained of water before you begin by allowing the sump pump to complete its cycle. Disconnect the sump pump’s power.
The discharge pipe will likely contain some water that will spill when the old check valve is removed so take care that nothing of value is nearby.

Step Two – Remove the Old Check Valve

One style of check valve looks like a PVC coupling; another uses hose clamps to fasten to the PVC discharge pipe. To remove, saw or use PVC cutters to cut above and below or loosen the hose clamps top and bottom.

Step Three – Install the New Valve

Insure the space cut into the PVC discharge pipe is not larger than the replacement valve. If it is, you will need to remove more of the discharge line, add a PVC coupling with a length of PVC that will allow a proper fit. The replacement check valve must be able to grip the PVC discharge pipe with both hose clamps top and below.
The check valve will be marked with an arrow indicating water flow direction. Install the replacement valve with the arrow pointing toward the drain line and away from the sump pump.

Step Four – Brace the discharge pipe

The discharge pipe must be supported so that it does not pull apart at the check valve.