1) pump with integrated design, built-in oil circulation system, comes with oil separator, with pressure relief function, vacuum up to -0.8 atm suction ≤ 4 meters with a clutch separation mechanism and four-way valve; 2) Vacuum pump with a clutch, a number of valves and pumps one. 3) tank with thicker steel production, internal acid phosphate treatment to improve corrosion resistance; using rectangular pipe beams form the ribs, under vacuum to ensure adequate strength; increase manholes, house maintenance ease; later Ministry dig material with holes, no tank clogging trouble. 4) the use of new technologies and new anti-overflow tank vapor separator 5) the use of pipeline corrosion ball, good sealing performance. 6) hose style peep tube, easy to install, ensure that the suction liquid level control. Website: http://www.sdliangnuo.com