Plumbing installation commonly used in a valve for deflation, the heating system in the process of water will have gas into the heating pipe, when the gas is congested, it will cause the heating is not hot. So to set the valve for the exhaust gas , So that the water circulation smooth
Coating Base Film,Solar Base Film,Reflector Base Film,Traffic Cloth Reflector Base Film
shaoxing xiangyu green packing co.,ltd. , https://www.xiangyubasefilm.com