... 5.Different thread Quick release air couplingHydraulic quick couplerP/NMT (male thread)D (mm)QHM02-1/41/4”NPT22QHM02-3/ ... with nickel plated . Part number: QHM09 quick couplerFeatures:1) Female Male different thread.(NPT ,BSP,BSPT,UNF....)2) Media: Compressed air ... must be firmly fastened withhose clamps or ferrules. Pneumatic hydraulic male ,female Germany,USA ,ISO style Quick release air coupling