Onyx pinch valves are ideal for on/off and throttling applications including raw sewerage (equalization basin flow), sludge (centrifuge feed) and lime slurry (pH control). The company's Isolator Rings are a convenient way to reliably measure pressure on sewerage, slurries and other hard-to-handle fluids. They are guaranteed to never clog or plug and are compatible with a wide array of gauges, switches, and transmitters. Onyx Valve Co.www.onyxvalve.com