... : aluminum2. ISO9001 and ISO140013. such kind of die-casting aluminum gas valve is for gas water heater manufacturer4. market: ... Germany, Japan, Poland, Italy, France,Hongkong, China and so on5. production ... , Panasonic, Riello, Thermowatt, Fotile, Karcher, Gaasu, Sengoku and other famous companies home and overseas gas valve for gas water heater