1, Exhaust Pressure: 7 Bar 2, Volume Flow: 3.2 m3/min 3, Good Balance, Small Vibration 4, Belt Driven Piston ... way2, Oil saving.3, Adopted import valves, best quality. W3.2/7 Piston Portable Breathing Air Compressor Models:ModelEquippedPower Driven methodRotation ... .7Splash SF4/5ZS1125 or 18.5kw-2V-belt90040.5Splash W3.2/7ZS1125 or 18.5kw-4V-belt9703.20.7Splash W3 ...