Hayward Check Valve, 4 in, Single, Inline True Union, CPVC, Socket x Socket - TC2400S Scranton - Toilet Partitions and there are two holes

and there are two holes in the dish to allow for adequate drainage

8 Gauge Vinyl Fabric

Replace Messy Hay Bales And Keep Sediment And Oil From Entering Drains And Inlets

or buried service

Hayward Check Valve, 4 in, Single, Inline True Union, CPVC, Socket x Socket - TC2400S Scranton - Toilet Partitions and there are two holesDesigned to help prevent the reversal of flow in piping systems where backflow could cause damage to filters, pumps, or process equipment. This HAYWARD check valve operates without the need for any adjustments or settings, and features an innovative square cut elastomer seat to seal at low back pressures. The true union design eases valve removal from piping systems without having to break down the pipe connections.