... :Steel,Brass 3.Thread:BSP,NPT hydraulic quick couplinghydraulic couplerAir quick coupling ,USA ,GERMANY COUPLINGhydraulic quick release coupling Coupling Features:1) Female NPT ,BSP , METRIC thread ... pressure drop and a multitude of connection options.2.ApplicationsQuick coupling use for Air tools,automotive,compressed air,mechanical engineering,compressors.3 ...