The American Plumber OR-233 O-ring is 3″ in diameter and fits Housing Models WLCS-1000 US-600 US-640 SY-2000 SY-2300 SY-2300S SY-2500 SY-2650 RO-3000 RO-3500 WRO-3000 WRO-3500 and Ace 4158622 Water Filter Housings.

The Aqua Pure 63597-174C O-ring prevents leaks in your filter housing by creating a secure seal. The 63597-174Cfits Aqua Pure housings and is 3 1/2″ in Diameter. Fits Housings: AP11S AP11T AP12S AP12T AP26T AP51T AP101S AP101T AP102S AP102T

The Aqua Pure 800 series O-Ring Model #6889832 prevents leaks in your filter housing by creating a secure seal. The 6889832 fits Aqua Pure housings in the 800 Series and is 5 3/4″ in Diameter.

The OmniFilter OK7 is the replacement O-Ring for the Omni Filter BF7 whole house water filter system.

Please look at the OK7. The OmniFilter OK50 contains one replacement o-ring for the following OmniFilter systems: BF7 Series A and BF8.