The Volkmann Multijector multistage Venturi pump has flap valves that close automatically in order of pressure balance between their respective Venturi stage and the collective vacuum chamber. An oil-free unit, it has no rotating parts or ignition sources, and requires no starting time for the next cycle. The Multijector M model features 0.3 to 2 mÂł per min of aspiration, while the Multijector G version offers 1.5 to 20 mÂł per min of aspiration. The Multijector RVA unit is made completely of stainless steel.