O-ring do dyfuzora Sta-Rite — 5P4R, DYNA-GLASS, SW5P4R (RU9374)

Diffuser o-ring for the Sta-Rite 5P4R, DYNA-GLASS, SW5P4R pool pumps. Small, cheap part; disproportionately large impact on pump performance — a hardened diffuser o-ring shows up as a stubborn slow-prime issue that looks like a bad mechanical seal or an air leak on the suction line.

Replace every time the diffuser is removed for any reason, and always as part of a routine seal service. Lubricate lightly with silicone grease before installation — never petroleum grease, which will swell the elastomer and cause a leak within weeks.