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The Valve O-ring is a small but critical seal used in various valves within heating systems. It prevents leaks by creating a tight seal between moving parts. This O-ring is designed to withstand high temperatures and pressures typical in boiler and burner applications. When replacing a valve or servicing a component, using the correct O-ring ensures a proper fit and long-lasting performance. This part is essential for maintaining system integrity and preventing water or gas leaks.