Water Filter Housing Replacement O Rings For PWFHT2520BT / PWFHO2520BR. We recommend consumers keep a spare O Ring on hand to avoid urgent situations. An o ring facilitates a water tight seal between the water filter sump and the water filter head. The most common o rings (o-rings) used in water filtration are made from Buna N material. Buna N is also commonly referred to as nitrile. This is the ideal choice for cold water filtration because they are inexpensive and have superior performance characteristics.
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