O-Rings are used to seal the water filter housing cap to the water filter housing sump to prevent leaks. It is important to lubricate your o-ring with food grade silicone grease.
2x o-rings for whole house 10" big blue filter housing
Recommended replace o-ring every 2-3 years
If you do not know the size of your system's o-ring, open the filter housing and measure the diameter of the o-ring. Your housing determines your o-ring size and not the filter that is used inside your housing.
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