Self priming, accurate operation in a short time, function, low flowing rate. Diaphragm pump with a sealing switch and coating to prevent corrosion. The main sealing to prevent accidental moisture and dust entry. More corrosion resistance and high temperature resistant, more durable. Designed with a self‑priming function to prevent backflow of liquids in the pump. Membrane material of original TPV granular material, suitable for spray paint, ceramics.