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The O-ring endless screw is a specialized sealing component used in boiler and burner assemblies to prevent leaks around threaded connections. This part combines an O-ring with a screw design, creating a reliable seal that withstands pressure and temperature variations typical in heating systems. It is commonly employed in fuel lines, water circuits, or gas trains where a secure, leak-free joint is essential. Replacing worn or damaged O-ring screws during maintenance helps maintain system efficiency and safety, making it a valuable spare part for technicians.