Wetted parts made of SCS13、SUS304 whilst a fluorine rubber O-ring is used on the suction check valve. This increases corrosion resistance.Self-priming interval is short and of high performance.Gas may filter in with the liquid, but the pumping can continue without problems.Expelling valve is particularly strong as it is in the middle of the piping and is meant to withstand heavy loads.Inspection and Analysis can be carried out without disassembly as it has a B.P.O（Back Pull Out）structure.