supply fire hose coupling 1.size: 1", 1.5", 1.75", 2", 2.5", 3", 4", 5", 6'' 2.working pressure: 8bar, 10bar, 13bar supply fire hose coupling according to your requirements 1. nominal diameter: 40mm, 50mm, 65mm, 80mm2. working pressure:10bar,13bar,16bar 3. type: American type, British type, Italian type and others4. material: aluminum, brass5. size : 1", 1.5", 1.75", 2", 2.5", 3", 4", 5", 6'' ...