Water Filter Housings for the Pentek CBC-20BB water filters: 155312 Pentek CBC-20BB filter fits in housings for 20 inch Big Blue water filters. Fits Culligan / USFilter / Ametek / Pentek 20" Big Blue Whole House Water Filter System . .Pentek CBC-20BB Carbon Water Filter Cartridge Specs: Dimensions:20" x 4-5/8" (508 mm x 117 mm) Micron Rating (Nominal):0.5 Micron Temperature Rating: 40?F to 180?F (4.4?C to 82.2?C) Initial ?P (psi) @ Flow Rate (gpm): 8.5 psi @ 4 gpm (0.59 bar @ 15.1 L/min) Chlorine Taste & Odor Reduction @ Flow Rate (gpm): >150,000 gallons @ 4 gpm (>567,800 liters @ 15.1 L/min) NOTE: Estimated capacity using 2ppm free available chlorine (FAC) with greater than 90% reduction. Pentek CBC20-BB Carbon Briquette Filter Materials of Construction: Filter Media:Bonded PAC End Caps:Polypropylene Inner/Outer Wraps:Polyolefin Netting:Polyethylene Gaskets:Buna-N (Package Of 2)