Pentair Pentek 150544 3G Standard Filter Housing, 3/4" Npt #20, Inch, Black/Blue Pentair Pentek 3G Standard Series Housings feature integral or mounting bracket caps, opaque and clear sumps, and caps for differential pressure gauges. They accept standard double open end (DOE) and our O-ring sealing cartridges. The O-ring design offers enhanced cartridge sealing for critical cartridge applications. 3G Standard Filter Housings are manufactured from durable polypropylene or clear Styrene-Acrylonitrile (SAN). Reinforced polypropylene housings have excellent chemical resistance and are ideal for many residential, commercial and industrial applications. Clear sumps are manufactured from Styrene-Acrylonitrile (SAN). They offer on-site examination of the cartridge and have excellent chemical compatibility. All are equipped with 3/4" NPT inlet and outlet ports. 3G Standard Filter Housings are available in 10" and 20" lengths OPAQUE SUMP MANUFACTURED with reinforced polypropylene offers excellent chemical resistance and is ideal for many residential, commercial and industrial applications FITS ALL 20" x 2.5" standard replacement filter cartridges DESIGNED WITH buttress threads and uniform walls for easier cartridge change and improved strength PRESSURE RELIEF BUTTON ON CAP for easy cartridge changes 3/4" NPT INLET AND OUTLET PORT and reinforced polypropylene cap with built-in mounting bracket