Generic O-Ring [9-3/8" ID x 1/4" Cross Section] (90-423-6142) grundfos this cartridge is clearly a

this cartridge is clearly a dimension-driven replacement intended for systems that rely on these exact measurements

A lid with clamp ring is useful because it helps secure and seal the filter tank while still allowing access for internal service and maintenance

and PA175 references

For compatible pool and spa plumbing

and orifice detail matter

Generic O-Ring [9-3/8" ID x 1/4" Cross Section] (90-423-6142) grundfos this cartridge is clearly aThe Generic 90 423 6142 O ring is designed for compatible sealing applications and features a 9 3 8 inch inside diameter with a 1 4 inch cross section. A seal like this is useful because it restores a larger O ring interface in assemblies where the original ring has worn down or no longer maintains a reliable seal. Larger O rings are commonly found in tank lids, housings, and other broad sealing surfaces where even pressure around the circumference