supply fire hose coupling 1.size : 1",1.5",1.75",2",2.5",3",4",5",6" 2.type: ... and others supply fire hose coupling according to your requirements1.Models: Nakajima coupling, John Morris coupling ,American type coupling, British type ... so on2. nominal diameter: 80mm3.material : aluminum/copper4. size : 1",1.5",1.75",2",2.5",3",4",5",65.type:John ...