Patented design, High operational reliability despite fluctuating or low compressed-air pressure, Integrated high dirt holding capacity pleated filter, VMECA Twofold SilencerPT assures low noise levels, Optional Air-Saving(AS) kit available to minimize energy consumption, Optional factory installed Air control/Vacuum release valves and Vacuum switch available, Compact size and light weight. Easily mountable and interchangeable vacuum cartridge.