Our o-rings are compatible with the 151122 o-rings. These fit the Big Boy, Big Clear, Full Flow filter housings. The oring is manufactured of rugged Nitrile (Buna-N) Material. Exterior diameter of the oring is approx 5-3/4" This part also works as a direct replacement for the following part numbers: Ace Hardware 4001756; American Plumber 152032, W10-OR; Ametek Kleen-Plus 151122-03; Culligan OR-100, 151122-27, 01019189; 151122, BB BUNA-N Additional Details ------------------------------ Bullet point: DURABLE BUNA-N O-RINGS: These replacement O-rings, made from high-quality Buna-N material, are designed to provide a secure, leak-proof seal for water systems. Compatible with full flow canisters, reverse osmosis water filters, under-sink housings, they offer excellent resistance to water, oils, chemicals. Perfect for whole house water filters ensuring consistent performance for your water filtration system. Ideal for home improvement projects, suitable for both DIY professionals alike. Product description: Our o-rings are compatible with the 151122 o-rings. These fit the Big Boy, Big Clear, Full Flow filter housings. The oring is manufactured of rugged Nitrile (Buna-N) Material. Exterior diameter of the oring is approx 5-3/4" This part also works as a direct replacement for the following part numbers: Ace Hardware 4001756; American Plumber 152032, W10-OR; Ametek Kleen-Plus 151122-03; Culligan OR-100, 151122-27, 01019189; 151122, BB BUNA-N