Portable Electric Driven Gas Booster rated to 5000-psi (345 bar) for oxygen/helium and 10,000-psi (690 bar) for Breathing Air or Nitrogen. Used for filling or topping off Rebreather bottles and larger oxygen cylinders from as low as 200-psi (14 bar). Offered in 2-stage and double acting configurations. Unit uses NO BELTS or Pulleys, making it the quietest Electric driven gas booster in its class. Includes a 2-hp motor available in 115-VAC, 230-VAC, 380-VAC and 460-VAC. Standard units include low and high limit switches to automatically stop the booster, pressure relief valve, inlet & outlet filters (5-Micron), gas inlet & outlet gauges (dual scale), hour meter, and outlet shutoff and bleed valves.