3" Coupling Check Valve Assembly - EP9700 Koi & Goldfish Treatments This basic 3" bottom drain

This basic 3" bottom drain allows dirt and debris to be removed from the pond bottom without the hassle of vacuuming or drain-downs

Polyethylene underlay keep diffusers from settling into the muck and prevents sediment erosion during operation

These units are designed to easily connect a pump that is in a skimmer or vault to a flexible or rigid PVC waterline

This Large AquaFalls pad is shaped like a trapezoid

This product contains 3

3" Coupling Check Valve Assembly - EP9700 Koi & Goldfish Treatments This basic 3" bottom drainThese units are designed to easily connect a pump that is in a skimmer or vault to a flexible or rigid PVC waterline. The check valve is important for stopping a backflow of water in the event of a power loss. Each unit has a heavy duty PVC Check Valve with a MNPT fitting that screws into the pump on one end, and a rubber coupling to connect to the water line on the other end. The table below shows which Check Valve Assemblies are compatible with