3 x housings of 20 Inch bb big blue filter with pressure release button and pressure gauge hole and plug , 1 Inch NPT with 3 x Bracket and 3 x Wrench (12 screws and washers included). Double O Ring 20 inch Big Blue inch. 1 inch inlet and outlet ports. Pressure release valve PLUS built in PLUS PRESSURE GAUGE HOLE + Plug in case you would like to use it without gauge. Accepts 20 inch x 4.5 inch diameter cartridges. Maximum Pressure: 90 psi. The item “3 x 20 Big Blue Whole House Water System Filter Housing With Wrench and Bracket” is in sale since Thursday, October 10, 2019. This item is in the category “Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters”. The seller is “max.water.usa” and is located in Tonawanda, New York. This item can be shipped to United States.