Profile: Plast-O-Matic engineers plastic valves, regulators, actuators standard and custom products. We provide assistance with valve application, pressure, flow and corrosion-resistant plastic piping. Our products include air release valve, ball valves, manual & actuated, gauge guards, diaphragm seals, manifold valves, metering pumps, pressure regulators, pressure switch, relief valves and shut-off valves.