Big Blue Filter Canister O-Ring Replacement

This O-ring is used in all of our standard whole house water filter packages including the WH1, WH1B+, WH2, WH3, WH4, WH5 Series, WH1-HF, WH1B+-HF, WH2-HF, WH3-HF, WHC+, and WH Chloramine. This 5 3/4" diameter FDA-Grade Buna-N O-ring is used in all 10" and 20" Pentek / US Filter Big Blue housings and should generally be replaced at least annually or whenever physical O-ring damage is noticed (stretched, cracked, etc.).