This O-Ring has a nominal size of 3-3/4”ID x 1/8” cross section x 4” OD which fits Culligan Unit 34A water filter housing.
Water Filter O-Rings should be replaced every 3rd filter change, or when leaking.
For Standard & 3G Standard Housings. For select cold water filters with polypropylene housings.
This O-Ring fits some MFG Models for Ace Hardware, Ametek, Culligan, Master Plumber and US Filter Plymouth Products. Check product description for determining fit.