We recommend Crystal Quest CQE-PT-03082 O-Rings for 10x2.5 Water Filter Housing. O-Rings for Counter Top and Under Sink 10x2.5 inch water filter housings, set of 3. Available in clear or black, for different systems, please choose identical to the one you already have. ACTUAL Diameter: 3.5 inches (90 mm x 3 mm) 2.5 x 10 Black O-Ring: CQE-PT-03082 2.5 x 10 Clear O-Ring: CQE-PT-03082-C, CQE-PT-03184 The most common o rings ( orings ) 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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