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This 3 pack O-Rings by iFilters are used to seal water filter housings. It has an ID of 5-1/2" and OD of just over 5-3/4 inches and is made of nitrile butadiene rubber (Buna-N) for flexibility and resistance to abrasion and tearing. Fits filter housings, which are used in various applications, such as drinking water purification, swimming pools, industrial processes, and more. The ORING-45 is the Original OEM replacement for the following filtration systems: MWH-D, MWH-D-WELL, MWH-D20, MWH-D20-WELL, MWHSD, MWHSD-WELL, MWHSD20, MWHSD20-WELL, XWH-600, and XWH-1000. Compatible with the following filter housing models: 49561; HD-10-R50, BBS; W10-PR, 152014, W2010-PR, 152015, W15-PR, 152016, W2015-PR, 152017, WWHC, 152022; HD-950, HD-950A; 150237, 150239, 150469, BBFS-22, BBFS-222; Hydronix HF45 Series Housings. The 151122 o-ring is a direct replacement for the following other part numbers: 4001756; 152032, W10-OR; 151122-03; OR-100, 151122-27, 01019189; 151122, BB BUNA-N. Available in two sizes - Standard (OEM) and Thick. Standard (OEM) is the same size o-ring that came with your filter housing when new. Thick is slightly thicker than the Standard size, which can help seal a filter housing that leaks from the cap seal when fully tightened. Whats included: This item includes three (3) O-Rings with "iFilters" branded packaging.