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Check valves are often used on sprinkler and irrigation pumps to prevent having to prime the pump.Check valves prevent the back flow of liquid or gas. Sprinkler and irrigation pumps often use check valves to stop water from draining out of the pump body when not in use. If the water flows out, the pump may require priming before it will siphon water again. Check valves are also used to prevent back flow contamination of water supplies to prevent flooding and prevent flow due to gravitational forces.Difficulty:EasyInstructions Things You'll NeedRuler or tape measurePump and intake pipingOld check valve1

Turn off and disconnect the power source to the pump before attempting to do anything with it to avoid electrical shock.

Remove the old check valve from the intake if you are replacing it.

Check the manual of the pump if you still have it, or the specifications for your make and model online. These sources will specify the inlet connection size.

Measure the inlet pipe or the outlet of the old check valve across the widest point to get the diameter if you cannot locate the specification.

Write the measurement down and keep it with you so you have a reference when shopping for the new check valve.

Always use the same size check valve as the inlet to the pump. A smaller diameter check valve will cause the pump motor to work too hard and possibly overheat. A larger diameter check valve can reduce the pressure and performance of the pump's output.

Electricity and liquids are a dangerous combination. Please shut down all equipment and disconnect from the power source. Even when turned off, equipment that is still plugged in can carry an electric current.