AIR COMPRESSOR IN TANK CHECK VALVE 1/2" X 1/2" FLARE TOTAL LENGTH OF VALVE: 2 13/16" INCHES TOP QUALITY MADE IN THE USA! TANK THREADS: " INCH MALE NPT (NOTE: 1/2" MALE NPT MEASURES ABOUT 3/4" IN DIAMETER.) INPUT THREADS: " INCH MALE FLARE FITTING (NOTE: WHICH MEASURES ABOUT 3/4" IN DIAMET UNLOADER LINE INPUT: 1/8" INCH FEMALE NPT (NOTE: 1/8" NPT MEASURES ABOUT 3/8" IN DIAMETER.)