4 x housings of 20 Inch bb big blue filter with pressure release button and pressure gauge hole and plug , 1 Inch NPT with 4 x Bracket and 4 x Wrench (16 screws and washers included). We beat the completion with Our High Quality Products This is not a low-priced Made in China Big Blue Housings that you can compare our product with some other advertised systems. 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 “4 x 20 Big Blue Whole House Water System Filter Housing With Wrench and Bracket” is in sale since Monday, October 28, 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, all countries in Europe, Canada.