Generic O-Ring [20-1/2" ID] [5/16" CS] O-103 (O-103) nutsboltsscrews and ST27 filter applications

and ST27 filter applications

For service companies

Useful when original swirl action has faded or worn down

A complete wet-end replacement is especially practical when the motor remains serviceable and the goal is to refresh the water-moving portion of the pump without replacing more than necessary

Matching the correct part helps preserve intended adjustment behavior and supports cleaner control restoration

Generic O-Ring [20-1/2" ID] [5/16" CS] O-103 (O-103) nutsboltsscrews and ST27 filter applicationsAn O ring helps create a dependable seal at a compatible very large circular connection, and this generic version is sized with a 20 1 2 inch inside diameter and 5 16 inch cross section using the O 103 reference. When a large O ring with this profile becomes worn, flattened, or cut, the assembly can lose the sealing support it should maintain around the full circumference. The 5 16 inch cross section gives this O ring practical value because larger