Check valves protect pool equipment by allowing water to flow in only one direction, helping prevent backflow that can strain pumps, heaters, and chemical systems. This collection includes full-flow check valves, CPVC options, and rebuild kits used when internal components wear or sealing performance declines. Check valves are commonly installed near circulation equipment where pressure changes are most likely to occur. They are often selected alongside plumbing parts, paired with circulation repairs involving pump parts, and coordinated with temperature control components found in heater and heat pump parts. Properly functioning check valves help stabilize pressure, protect sensitive equipment, and support consistent system operation.