1/4" npt, filter regulator, mini poly bowl air filter & regulator, removes water & particles to protect air tools, compact filter/regulator duo combines functions to make effective use of limited space, cast aluminum body construction resists corrosion, locking adjustable pressure knob maintains consistent pressure setting & mounting bracket makes installation easy, 40 micron bronze sintered filter element, dial pressure gauge & automatic/manual full time fluid drain, 1/4" npt on both inlet & outlet, polycarbonate bowl features a transparent view of fluid level with 1.4 oz capacity, push to connect drain tubing connection channels water safely away, operating temperature range between 25 degrees fahrenheit & 140 degrees fahrenheit.