Interstate Pneumatics PW7173 3/8" Female Inlet Pressure Washer Trigger / Spray Gun. Interstate Pneumatics offers various pressure washer spray guns for both, commercial and residential users. This spray guns is equipped with the 1/4" FNPT so that the wand pipe can be easily threaded into the gun. The inlet side of the gun will fit any 3/8" FNPT fitting so that the pressure hose can be connected. Tested at the factory to ensure the value you have come to expect from us.