O-Rings for Under Sink and Whole House 20x2.5 inch water filter housings. Will typically fit 20"x2.5" white or blue housings. ACTUAL Diameter: 4" (102 mm). Single o-ring.
Material: Buna-N Rubber.
The most common o rings ( also called oring , rubber gasket , o-rings, rubber seals ) 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.
Typical Housing dimentions vary and may be 22"x5" (with standard 20"x2.5" cartridges), which can differ by a few inches. Measure cartridge size or actual o-ring diameter for better matching.
ACTUAL Diameter: 4" (102 mm x 3.8 mm)
Quantity: 1 oring.
Alternative model numbers
Pentek / Pentair 151120 , Crystal Quest CQE-PT-03180