• Clear Filter Housing with Black Cap and pressure relief valve• Manufacturer: Hydronix• Connection Size 1 inch inlet/outlet Ports • Diameter 4.5 inch Cartridge • Length 20 inch• Fits nearly any brand of 20" x 4.5" filter cartridges 1" • Female threaded ports allows for high flows and easy installtion • Pressure release button makes allows for easier removal of filter housing • Mounting holes line up with all standard Big Blue mounting brackets • HOUSING ONLY. DOES NOT include filter cartridges, brackets, fittings, housing wrench, or mounting screwsHydronix 20" Commercial Filter Housing W/Pressure Relief 1"Hydronix Commercial Heavy Duty Filter Housings offer the versatility to meet all of your large-capacity filtration needs, including high-flow and heavy-sediment applications. The extra large housing allows for greater cartridge capacity, reducing the number of vessels required for high flow-rate applications. The High-Flow Polypropylene (HFPP) cap is available with 3/4", 1" or 1-1/2" NPT inlet and outlet ports. The 1-1/2" internal port allows a greater volume of liquid to pass through the HFPP cap more rapidly.Commercial Housings are compatible with a broad range of chemicals and are available with or without a pressure relief button. They accept a wide variety of 4-1/2" diameter cartridges. Pressure Relief Button Large capacity for high flow applications Polypropylene construction Accomodates most 4.5"x 20" filter cartridge NSF Certified to Standard 42 HF45_DS.pdf