Our suction units have a good look and are practically-designed, with 3 types available. The Suction Unit boasts the following features: Full varieties and different price level of suction units available for customers to choice. High-quality polyester is adopted for the suction bottles. Regulator has high stability and is easy for adjusting. Collection jar has 1L, 1.2L, 2L different capacities, can also provide 3L, 5L jar (with cart) Can be connected with terminal plugs different mode by using screws. Collection jar is compressive enough to bear high vacuum pressures.