The Hayward SX200Z4PAK2 Valve Union O-Ring is a high-quality rubber gasket designed to ensure leak-proof seals in valve unions within HVAC systems. Measuring 2.0 inches, this O-ring is used in conjunction with valve unions to create a secure and durable connection between pipes and valves, preventing leaks and maintaining system efficiency. The rubber material offers excellent flexibi... https://www.usapoolshop.com/sx200z4pak2-hayward-valve-union-o-ring