This volume in the Fundamentals for the Water and Wastewater Main Operators series covers the basics of piping and valves in water and wastewater plants, including details on fittings, strainers, filters, traps and control systems. The book explains how pipes and valves are used to feed materials (e.g., chemicals) into influents and effluents and also siphon off unwanted liquid and gaseous byproduct. Also covered is how pipes are developed into systems and subsystems and coordinated into a plant-wide functioning unit.