Open Box – AS IS -four housing contains some manufacturer Molding voids that is visible but will not effect the unit performance. Box contains 4 housing each housing comes with with one wrench,one bracket and its screws Detailed Description: 20 Inch x4.5 Inch BB Clear Whole House Filter Housing 1Inch Ports w/ Pressure Release Includes: 4x 20 inch x 4.5 inch BB double o ring filter housing with pressure release button and 1/8 inch NPTF pressure gauge hole Only + 4 x bracket + 4 x wrench. (Parts are not assembled together) Specifications: Feed water pH range: 4.0 – 10.0 Double O ring Housing NPTF in/out Port Sizes: 1 inch Easy screw off for quick filter changes Accepts standard 20 inch x 4.5 inch diameter water filter cartridges Clear Filter housing for easy maintenance, allows for visual inspection of filter cartridge Heavy-duty construction Rated for pressures up to 90 PSI (6.20 bar) maximum operating temperature 125°F (52°C) Made from grade polypropylene Head/ Cap Color : Black Sump/ Housing Color : Clear Pressure Release: Yes Preferable feed water pressure range: 20 – 90 PSI to Get the best filtration results keep it less than 60 PSI. Maximum feed water TDS: 2000ppm Flow Rate / GPM 1-40* GPM for 1 inch Inlet / Outlet 1-35* GPM for ¾ inch Inlet/Outlet * Pressure drop will be determined based on feed water pressure, filter cartridge selection, fluid viscosity, filter life and conditions Installation is very easy for the BB Clear Water Filter Housing, including the tools required for installation: 1 Wrench + 4 Brackets + 16 Screws. Filter Housing Head comes with Pressure-Release button to release water pressure, allowing for easier filter replacement. Clear Filter Housing makes it easy to keep track of the filters’ service life and shows when you need to replace them without needing to open the housing to view them. Double O ring Housing, securing the Housing from leakage, and keeping your system sealed and clean. The Filter Housing comes with a 1″ NPT port for optimal water flow. According to your needs, you can pick the Filters you want and provide water filtration for your whole house. Accepts standard 20 inch x 4.5 inch diameter water filter cartridges. Easy Build-It-Yourself Home Water Filtration.