3" Coupling Check Valve Assembly - EP9700 Koi & Goldfish Treatments These units are designed to

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

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

Small Boulder

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

1 Green (coarse) Matala Filter Pad

3" Coupling Check Valve Assembly - EP9700 Koi & Goldfish Treatments These units are designed toThese 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