Millennium Turbine Sanitary and Stainless Steel Silent Pneumatic Vibrators are ideal for sanitary applications or harsh chemical environments, maintenance free – pre-lubricated for life, quiet – no more noise than an electric motor at 68dB, and threaded exhaust ports allow for maintaining a clean environment. Also available are MHI & MHISS models designed to produce high frequency and maximum forces. Intermittent duty only.