Is a metering pump for chemicals, liquids, and viscosities. Movement of dual diaphragm sheets That is driven by wind pressure from External air compressor The advanced technology of the product is non-stalling and non-freezing. Available in pipe sizes ¼ “, ½”, 1, 1 ½ “, 2 and 3 inches in the pump body material. Available in Aluminum, Stainless Steel, Polypropylene, Cast Iron etc. Each material is resistant to the pH of different chemicals. Including the diaphragm sheet There are materials to choose from, Neoprene, Buna-N, PTFE etc.