Portable Charging Station With Single Stage 3 Cfm Economy Vacuum Pump. A lightweight, durable, steel frame cart that contains all the necessary tools to quickly and conveniently charge the A/C system. No need for different sized charging cylinders with Mastercool’s rugged die cast electronic scale. Simply place the refrigerant cylinder on the scale and charge. Features include a rugged, lightweight steel cart with wheels and convenient storage pocket for scale and hoses. Portable charging station can be taken almost anywhere service in needed. Extruded aluminum manifold with long lasting valve design. 240 lb capacity scale with long lasting 9V battery (60 hrs). R134a 2-Way Manifold with 2 1/2″ gauges. 3 CFM Single Stage Vacuum Pump. Manual 134A Couplers with a set of Hoses.