KleenWater Whole House Water Filtration System, Premier 4520 Water Filter, Dirt Rust Sediment 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 4.5 x 20 inch KleenWater brand KW4520G 5 micron dirt, sediment and rust water filter cartridges