The 1/2in. I/O, #20 Slim Line Blue Housing/Black Cap with Pressure Relief is a filter housing that is filter that can be used along with a variety of applications like industrial, residential, and commercial. The housing comes with a black reinforced polypropylene cap and a blue reinforced polypropylene sump at the bottom. The filter housing is suitable for high chemical compatibility and a variety of low flow applications. It is best used for applications like humidifying systems, pre and post reverse osmosis systems, sinks, and filtration. The filter housing comes with a pressure relief valve that relieves the pressure at the time of filter change. The length of the cartridge filter is 20?, diameter of the filter is 2.5?, the length of the housing is 20?, and the inlet/outlet measure 1/2?.