The Frigidaire / Electrolux 218720100 O-Ring fits all Frigidaire and Kenmore refrigerators that use either the WF1CB
PureSource or WFCB
PureSourcePlus refrigerator water filter.
The 218720100 O-Ring is also known as P_N_218720100 or P_N_218904301.
The purpose of the O-ring is to seal the filter housing to the refrigerator, which will prevent leakage. On occasion it will become damaged when you unscrew the filter housing, especially when it’s tight enough to require the Frigidaire
Filter Wrench to be unscrewed. If there are any visible marks or tears on the O-ring, it should be replaced, as well.
: Applying a small amount of vegetable oil (olive oil and canola oil will also work) and tightening the filter cup by hand will reduce the risk of damaging the O-ring. This will also make it much easier to remove the filter when it’s time replace it.