Jandy 7307 2.5–3 Inch Pool Check ValveHeavy Duty Check Valve for High Flow Pool Plumbing Systems The Jandy 2. 53 Check Valve (7307) is a professional grade pool plumbing valve designed to prevent water backflow in high flow residential pool and spa systems. Manufactured by Jandy, this check valve helps protect critical pool equipment by ensuring water flows in only one direction through the plumbing system. Check valves are essential components in modern pool equipment pads, especially