... Pulley,V-belt,Inlet Silencer(with air filter),Safety Valve,Pressure Gauge,Lubricating Oil,Anchor Bolt,flexible joint,non return valve.4 ... lobes roots blower features:o Wide range of capacity and pressure o Delivers completely oil-free air o Low oscillation and ... by computer o Smaller change in capacity against change in pressure o High efficiency due to special impeller design, great air ...