Automatic A/C Cart & Single-Gas Compatible. The single-gas R3AC50 A/C cart is the recovery, recycling, and recharge machine your shop needs to provide simple, quick, and smart service. Featuring a 50-pound refrigerant tank and a dual-fan evaporator, the R3AC50 maximizes productivity and increases efficiency by automatically checking and displaying oil and refrigerant levels with easy-to-use control panel navigation.