The Robinair 34888HD heavy duty machine recovers, recycles, evacuates, leak-tests and recharges R-134a with 98.5% efficiency in both small and large mobile air conditioning systems. The new design features include a Large capacity, 50lb. removable tank and liquid pump for larger A/C systems, typically found in buses. A Nitrogen port to dry and leak test A/C systems. Fully automatic recovery, system evacuation, leak testing, refrigerant charge and oil drain/inject. Optional printer for capturing and retaining vehicle service data.