How to Install a Check Valve on the Suction Side of a Pump


A check valve is a one-way valve that prevents liquid from moving backward through the pipes or hose. A check valve can be used to prevent siphoning, in which water flows back through your pipe or hose via gravity in the direction that you do not desire it to go. Adding a check valve to the suction side of a pump will prevent water from flowing backward through the pump while the pump is not operating.

Things You'll Need

  • Wrench
  • Teflon tape
  • Twist off the hose fitting on the suction side of the pump with a wrench.

  • Measure the size of the fitting you just removed and buy a check valve of equal size. You can buy a check valve at either your local hardware store or a specialty plumbing supply store.

  • Read the markings on the check valve to determine which direction of the valve corresponds with a given flow direction. The valve will likely say "inflow" or "outflow" at opposite ends, or it will have arrows which point in the direction of each ends flow.

  • Wrap all the threads on the check valve with Teflon tape. Apply at least three layers of Teflon. This creates a watertight seal.

  • Align the valve with the pump such that the "outlet" of the valve goes to the inlet of the pump.

  • Screw the valve into the pump inlet. Start by screwing it in with your hand, and finish by tightening it with a wrench.

  • Screw the hose or pipe to the "inlet" end of the check valve. Twist it on with your hands, then finish by tightening with a wrench.

Related Searches


  • "Plumbing 1-2-3"; The Home Depot; 2005
  • "Plumbing Do-It-Yourself for Dummies"; Donald R. Prestley; 2007
  • Photo Credit pump image by Aleksander Nordaas from
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