Swing Check Valves
Lets water flow only one way. Good for keeping the pump primed when the power is off. Prevents water from back flowing from the filter into the pond.
The check valves are white or Clear The clear allows you to see action inside, available in many sizes. These PVC check valves are the flapper type without springs and do not get clogged up with algae.
Swing check valves help protect your pond from losing water in the event of a pump failure or other plumbing issue.