O-Rings for Under Sink blue and Whole House 20x2.5 inch water filter housings. A set of 3 orings. ACTUAL Diameter: 4" (102 mm)
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 12"x5" (with standard 10"x2.5" cartridges), 22"x5" (with standard 20"x2.5" cartridges), or other dimentions. Measure cartridge size or actual o-ring diameter for better matching.
ACTUAL Diameter: 4" (102 mm x 3.8 mm)