The pump is circulating water pump on a multi-use basis, based on the characteristics of smaller laboratories, improve transparency tank corrosion, corrosion stainless steel shell and a variety of models, reduce the volume of improvements made, with small size, light weight, outside type appearance and other characteristics, double table, double exhaust, and a ice hole. (1) The machine adopts the double-tap, can be used alone or in parallel with two vacuum tables. (2) the host of stainless steel and corrosion-resistant materials movement movement has two models. (3) corrosion-resistant, non-polluting, low noise, easy to move, also based on user needs to install a vacuum valve.