... Pneumatic Quick Coupler air tools 1: Standard:ISO Standard 2: Marerial:Steel,Brass 3: Thread:BSP,NPT ,BSPT,METRIC Pneumatic ... quick coupler air toolsFeatures:1) ISO series of quick coupling use metal and sealedmaterials, such as brass, steel ... couling widely used in allsectors of hydraulic pneumatic systems7) We also use different materials to ... -1/21/2”NPT22 Pneumatic quick coupler air tools