Frigidaire O-Ring is designed to fit Frigidaire / Kenmore refrigerators that use the PureSource / PureSourcePlus refrigerator water filters (WF1CB / WFCB).
It prevents water from leaking into your refrigerator compartment.
O-Ring helps to seal the filter housing (filter cup) to the refrigerator.
It is recommended that you check the O-ring while replacing your filter and if its elasticity is compromised, it should be changed to prevent leakage.