hose couplings Its production technique often uses die-casting or pouring/teeming practice.And the brass Storz coupling often uses forging or hammering.Material:Brass or AluminumConnection Method:Binding ExpansionTyple:HermaphroditicReference Standard:DIN14302Specifications:1", 1-1/2", 2" ,2-1/2", 3", 4", 6" Storz fire hose couplings Germany type