Make replacing or connecting the hydraulic couplers on tractors, trailers, oilfield and industrial equipment simpler and faster with our Hydraulic Pressure Relief Tool. This tool enables quick easy connection of couplers under pressure. The set includes both male and female coupling tools that ONLY fit 3/8" 5675 / Ag / Pioneer size. -A quick release hydraulic couplings. The pressure relief tool can save you time, money, and frustration when connecting tractor implements or hydraulics hoses under pressure. Keep this compact tool in your tool box and get ready to enjoy a hassle-free connection every time! **PLEASE DOUBLE CHECK YOUR COUPLING SIZE WITH SIZE CHART IN PRODUCT PICS BEFORE ORDERING** Will only fit 3/8" 5675 / Ag / Pioneer size quick couplers and no other size.