The 3M CFS12T is a standard diameter two-high drop-in style filter housing with 3/4 inch inlet/outlet connections and a built-in pressure relief button. 1/2 inch NPT adapters included. Cartridges sold separately. The 3M CFS12T features an innovative, transparent design. These housing filters are excellent at keeping sediments and scaling salts away from your water supply. Ideal for use in filtration for coffee and hot tea machines, food service point of entry, and ice makers. The 3/4” inlet/outlet connections make installation within the existing pipelines easy, but also includes a ½-inch National Pipe Thread (NPT) adapter that provides multiple sizes for either point-of-entry or single applications with higher flow rates. This water filter system features a pressure relief button and a built-in shut-off valve that offers maximum flexibility.