Pentek 20" Standard Clear Inline Sediment Filter Housing. Used for Pre Filter and Post Filter Applications. Standard filter housings are manufactured of a durable polypropylene or clear Styrene-Acrylonitrile (SAN). All are equipped with 3/4" FPT inlet and outlet ports. Reinforced polypropylene housings have excellent chemical resistance and are ideal for many residential, commercial and industrial applications. Clear sumps are manufactured from a clear, FDA-approved Styrene-Acrylonitrile (SAN) and offer on-site examination of the cartridge. This filter housing will accommodate a wide range of 2-1/2" and 2-7/8" diameter cartridges.