Product Specifications: Flow Rate: 2GPM @ 65psig Product Dimensions: 15.1" X 3.6" X 2.52" Capacity (in gallons): 8,480 Cartridge lifespan: 1 year under warranty. Application: Residential POU (Point of Use). Same as our ADV (WD-S-8K-ADV) but with more Heavy Metal removal media, for residential areas with increased levels of heavy metals in the water. System includes: WD-S-HMADV-REP cartridge, Head with a built-in shut off valve, inlet and outlet welded in 1/4" John Guest fittings | Fits All 1/4″ Plastic Flex Tubing and Flexible Copper Tubing used for water supply to ice makers and refrigerators, etc. 1/4” JG also fits the 1/8″ PEX TUBING as its O.