KleenWater Premier4520CL Chlorine Whole House Water Filter System Multi-Pack - 1 Inch Inlet/Outlet - Transparent Housing - 7 GPM with Bracket, Wrench and Three 4.5 x 20 Chlorine Removal Cartridges 1 Inch FNPT threaded inlet/outlet filter head made of reinforced polypropylene Equipped with filter wrench, mounting bracket and hardware Transparent housing made of safe PET (polyethylene) plastic Three KleenWater brand 4.5 x 20 inch carbon block filter cartridges - KW4520CB