Prepare your semi truck to be Ready for the Road Ahead , with the Mastercool Semi Automatic R-134a A/C Recovery, Recycling, and Recharging Machine that delivers clean AC refrigerant. To ensure the AC system in a vehicle has clean refrigerant, this portable machine works to extract the contents, cleanse them, then return them to the vehicle. Fashioned with a cabinet design to increase air flow. FleetPride is your First Click in Heavy Duty .