Storz Coupling / Fire Coupling 1)material: Aluminum & brass. 2)Size:1" to 4" 3)Thread standard: BSP. Storz Coupling / Fire Coupling(fire coupling, female threaded coupling&male threaded couplings,Aluminum storz coupling & brass storz coupling)1)Material: Aluminum & brass.2)Size:1" to 4"3)Thread standard: BSP,etc.4) Suitable market: European countries.