How can Robinair's industry leading 34788 A/C recover, recycle, and recharge A/C machine get any better? Here's how. The new Robinair 34788NI-H is a combination of easy to use and superior accuracy. It recovers, recycles, evacuates, leak tests, and recharges R-134a quickly and accurately. Robinair's patented Automatic Refrigerant Refill feature maintains a user-selectable amount of refrigerant in the internal vessel and signals when it’s time to change supply tank, no monitoring required. Automatic oil drain and inject make putting A/C lubricant back into the system simple and hassle free. An optional refrigerant charge and oil capacities database is available for North American market vehicles which saves time from having to look up unknown charge amounts.