The OmniFilter OK25 is a genuine replacement O-ring designed specifically for OmniFilter whole house and undersink water filter housings, including models such as the OmniFilter U25, U26, U30, OT32, OB1, BF7, and other compatible standard 10-inch OmniFilter sumps. This O-ring creates the watertight seal between the filter housing cap and sump, preventing leaks when the housing is pressurized during normal operation.

OmniFilter recommends replacing the OK25 O-ring at least once per year, or every time you change your filter cartridge if you notice any signs of wear, cracking, flattening, or leakage around the housing cap. Routine replacement of the OK25 ensures a reliable seal and prevents slow drips or housing failures in your OmniFilter system.

Yes, for proper sealing and long service life, lightly lubricate the OK25 O-ring with food-grade silicone grease before seating it into the groove of your OmniFilter housing. Avoid petroleum-based lubricants, as they can degrade the rubber compound of the O-ring and shorten its lifespan. Make sure the O-ring is seated evenly in the groove before hand-tightening the housing sump.

The OK25 O-ring is manufactured from food-grade, drinking-water-safe rubber material compatible with OmniFilter housings used in potable water applications. While the O-ring itself is a sealing component (not a filtration media with a micron rating), it is designed to meet the material safety standards required for OmniFilter residential drinking water systems.

If your OmniFilter housing leaks after installing a new OK25, first depressurize the system, unscrew the sump, and confirm the O-ring is properly seated in the groove without twists, pinches, or debris. Clean the groove and mating surface, apply a thin coat of silicone lubricant, and reinstall. If leaks persist, inspect the housing sump and cap for cracks or stress damage, as a damaged housing will not seal even with a new OK25 O-ring.