Balcrank Mini Filter/Regulator fits 1/4" NPT(F) and includes an automatic drain and pressure gauge. Single-Piece Filter/Regulators are the best choice for pump air control, with a filter to prolong the wear life of the pump, an automatic drain to remove moisture, and a regulator to adjust the pump air supply pressure for the best performance. Mini Series filter/regulators are compact for low-volume air applications and offer excellent water removal efficiency, featuring a 5-micron, depth-style filter element, full-flow gauge ports, and a heavy-duty, die-cast zinc bowl with a max primary pressure of 250 PSI.