The Pentair® Style Corrosion Resistant Check Valve Flapper is an essential replacement component for Pentair-style check valves, ensuring the continued efficiency of your pool plumbing system. Designed with durability in mind, this flapper is crafted from corrosion-resistant materials, making it ideal for harsh pool environments and prolonged exposure to water chemicals. It prevents backflow, maintaining optimal water flow and protecting your pool equipment from damage.