Feature●NEW OR-250 (OR250) Replacement Filter Housing O-Ring●Compatible with Culligan # WH-HD200-C, 3M Filtrete 3WH-HD-S01●5-1/2" inside Diameter, 5-7/8" Outside Diameter, 0.2" Thickness●Includes Two O-RingsDescription OR-250 (OR250) Replacement Filter Housing O-Ring Buna-N ORing Compatible with Culligan (2 Pack）(Compatible with WH-HD200-C, 3M 3WH-HD-S01, Dupont WFAO100, 3M AP801B/T, AP802B/T, etc)