We provide good discount on large quantities order. THIS LISTING IS FOR A BRAND NEW ½" MALE NPT X ½" MALE FLARE AIR COMPRESSOR IN TANK CHECK VALVE WITH 1/8" FEMALE NPT THREADS ON THE SIDE FOR AN UNLOADER LINE. IF YOUR COMPRESSOR DOES NOT HAVE AN UNLOADER LINE YOU CAN SIMPLY PLUG THE 1/8" FEMALE HOLE ON THE SIDE. TOP QUALITY MADE IN THE USA! TOTAL LENGTH OF VALVE: 2 13/16" INCHES TANK THREADS: ½" INCH MALE NPT (NOTE: 1/2" MALE NPT MEASURES ABOUT 0.84 INCHES OUTSIDE DIAMETER) COMPRESSOR LINE INPUT THREADS: ½" INCH MALE FLARE FITTING (NOTE: WHICH MEASURES ABOUT 0.84 INCHES OUTSIDE DIAMETER) UNLOADER LINE INPUT: 1/8" INCH FEMALE NPT (NOTE: 1/8" NPT MEASURES ABOUT 3/8" IN DIAMETER.) WRENCH SIZE NEEDED FOR INSTALATION: 7/8"