... , China , Russian; 2) Size: from 1" to 6"; 3) material: aluminum. fire hose coupling are used in a wide variety of ... processing, dry bulk handling, agricultural, and water, etc. 1) Material:Aluminum;2) Cast method available: Gravity Cast, Sand Cast ;3) Type ... resistance to vibration.(4) We are qualited member of NFPA. Aluminum Fire Hose Coupling