Exair reversible drum vacuum system is driven by air pressure, and can be easily mounted to an assembly with a closed head compartment. Its heavy-duty vacuum engine allows filling of a drum with 55 gallon capacity in less than two minutes. The knob lock when twisted permits fast emptying of fluid from the barrel. This assembly compresses several functions in a single pumping mechanism. Such tasks include refilling of cooling sump, vacuuming of floor leaks, and transfer of contaminated solution to purifying cylinders.