Balcrank Air Filter fits 3/8" NPT(F) and includes a manual drain. Air filters are used to remove moisture and particulate solids from air supply lines, featuring a heavy-duty, die-cast zinc body with a max primary pressure of 250 PSI. Standard Series filters are for heavy-duty lube systems, featuring a metal bowl with sight glass and a 40-micron, depth-style filter with a large filter element surface.