Reinforced polypropylene housings have excellent chemical resistance and are ideal for many residential, commercial and industrial applications. Clear sumps offer on-site examination of the cartridge. Opaque Standard Filter Housings are molded from rugged reinforced polypropylene. They offer outstanding chemical compatibility and are ideal for use in a variety of low-flow applications. These applications include under-sink and countertop residential filtration, pre- and post-reverse osmosis filtration, recreational vehicle filtration, food service and humidifying systems. Features: Standard 20" Cartridge Length 3/4" FNPT Ports Blue Polypropylene Housing with Black Cap Valve-in-Head Thick Walls for Increased Strength Leak-Proof Sealing with Top?Seated Floating Buna-N O-ring