Online Engineering, Corp. of Cincinnati, Ohio has been supplying quality equipment to the wastewater treatment industry since 1988. Our products include valves, piping, gear boxes, aeration systems, telescopic valves, rotary sludge valves, scum skimmer pipes, swivel joints, swivel pipe assemblies, airlift pumps, diffusers, hoists and control systems. Many of our products are engineered and built to your specifications right in our factory, allowing us to provide customized parts to fit any application.