stroz coupling 1.perfessional casting made. nice surface ,higher wroking perssure we can do. 2.made of aluminum storz coupling1.Size:1",1.5",2",2.5",3",4"2.storz adaptor3.working pressure :10bar or 16 bar4.made of aluminum5.we produce storz/john morris/gost /french type's coupling nozzle and fire hose storz coupling