Captain O-Ring - Pentek, Pentair Water 151122 Replacement for OEM Size Big Blue O-Ring Buna-N ORing (3 Pack) Part: Pentek Water 151122 O-Ring (3 Pack) Includes 3 replacement o-rings (also called seals or gaskets) to repair your leaking water filter housing [OEM UPC: 051678511220 , 885343762095] 151122 OEM Size o-rings are approximately 5.5" Inside Diameter x 5.83" Outside Diameter x 0.165" Thickness Direct Replacement for the following part numbers (see description below for full water filter compatibility list): Ace Hardware 4001756; American Plumber 152032, W10-OR; APEC O-RING-HB; Ametek Kleen-Plus 151122-03; Culligan OR-100, 151122-27, 01019189; Pentek 151122, BB BUNA-N Manufactured and Warrantied by Captain O-Ring LLC, with decades of experience in the sealing and chemical industry.