Generic Buna-N O-Ring [15-15/16" ID] [5/16" CS] (90-423-6115) leviton or no longer controlling flow

or no longer controlling flow direction correctly

Restores better day-to-day control over filtration routing

A return face cover is useful because it helps finish the return opening neatly

Helps restore dependable trapped-air release

Generic Buna-N O-Ring [15-15/16" ID] [5/16" CS] (90-423-6115) leviton or no longer controlling flowA Buna N O ring helps create a seal at a compatible large diameter circular connection, and this generic version is sized with a 15 15 16 inch inside diameter and a substantial 5 16 inch cross section using the 90 423 6115 reference. When a large profile O ring becomes worn, stretched, or compressed, the assembly can lose the sealing support it should maintain around the full circumference. The heavier 5 16 inch cross section gives this O ring