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?2PC 151121 OR-38 O-Ring for Pentek Water Filter Housings. | ?Direct replacement for the following part numbers: Pentek 151121; American Plumber W38-OR , 152031; Ametek 151121; Campbell 10800-034; Culligan OR-38. | ?About 3.375" ID x 3.75" OD x 0.2" thickness. | ?Buna-N O-Ring. | ?High Quality and Long Lasting Durable O-ring.