Approximate Inside Diameter 5.465 inches
KleenWater KW101 o-ring compatible with the following water filter housing manufacturers and models:
WS03X10039,151122, GXWH30C, GXWH35F, GXWH40L, WHKF-DWHBB, WHKF- C9, WSO3X10039 and Culligan HD-950A
American Plumber, Pentek, Kenmore 625.384480, Ametek, Pentair, Culligan Big Blue whole house filter housings 10 and 20 inch length wide body
Ace Hardware 4001756, 7295240, 49561, American Plumber W10-OR and 152032