Replacement O-ring for Pentek 10" and 20" Big Blue and Heavy Duty Housings private labeled as Culligan HD-950, HD-950A, Ametek HD10R50BBS, US Filter, Plymouth, Kleen Plus, and American Plumber W10-PR, W2010-PR, W15-PR, W2015-PR, WWHC,152014, 152015, 152016, 152017, 152022.

O-ring can be used in place of the OR-100 by Culligan, True Value 852-574 and American Plumber W10-OR.

Note: This o-ring will NOT work in Pentek Big Clear or Big White housings