The Pentek 150574 3G housing has 3/4"" inlet/outlets, The Pentek 150574 housing must be used with one of the two Pentek pressure gauges, The housing will not work if a pressure gauge is not used, The pressure gauge helps to determine when the water filters need to be replaced, The Pentek 3G MM 150574 filter housing can use any 10"" L x 2, 5"" W water filter, The Pentek 3G IB MM 150574 water filter housing has an integrated bracket so a separate bracket does not need to be purchased, SKU: CWD1955