Nanpu 14 Npt Compressed Air Filter Regulator Combo Piggyback, 5 Micron Brass Element, Poly Bowl, Semi-Auto Drain, Metal Bracket, 0-150 Psi GaugeInstallation and Operating: 1 Please cleaning the port and fitting before installing, avoiding bringing dirty thing to the air path2 Pay attention to direction of air flow and arrow pointing on body if matc..