The Omnifilter OK25 O-ring is the replacement o-ring for the Omnifilter U25 Series A, B, C & D. This o-ring is also used in the Omnifilter U27 Whole House Water Filter System. The OK25 creates a tighter seal, which reduces the chance of leakage that may cause water damage. To ensure the best performance, replace these o-rings after every third water filter change.

Specifications:

• Inside Diameter: 3.75"
• Outside Diameter: 4.125"
• Material: Buna-N

Fits: CBF1, CBF3, OT32, USM2, SFM2, RO2050 Systems

NOTE: To keep your filter housing operating at peak performance, it is important to replace the filter and o-ring regularly. If it is time to replace your housing, Fresh Water Systems carries an extensive line of compatible standard filter housings.