Profile: Pneu-Hydro Products is a manufacturer of pneumatic and hydraulic valves and systems. We design and fabricate industrial valves for hydraulic, pneumatic and specialized fuel applications. Our commercial products include control valves, regulators, check valves, relief valves, filters and actuators. Our stock relief valves remain bubble-tight up to cracking pressure. Our shuttle valves are made from 316 stainless steel. Our pressure indicator offers easy to read evidence of the presence or absence of pneumatic pressure in a control circuit.