Compression Stage: Two Stage. Size: L 335mm W 175mm H 340mm. Gas channel anticorrosive temperature-resistant design. Cooling System: high pressure cylinder circulating water cooling, motor forced-air cooling. Gas overpressure safety valve: automatic shut down when the pressure reach 32MPA. Please add ilubricating oil before you start using the machine first. Don’t forget to put the lube oil into the compressor before running. When the compressor working, the cooling system must be working at the same time. The machine must not be working without oil, so you must pay attention to the level of oil. 1 x High Pressure Air Pump.