... product detail:1. material: aluminum2. ISO9001 and ISO140013. such kind of die-casting aluminum gas valve is for gas water heater manufacturer4. market: Germany, Japan ... , Noritz, Ariston, Viessmann, Panasonic, Riello, Thermowatt, Fotile, Karcher, Gaasu, Sengoku and other famous companies home and overseas gas valve for gas water heater