The Reliance Valves HEAT112050 Easifit 4-in-1 TMV 15mm is a round mixing valve designed for use with boilers. It is a high-quality product from the trusted brand Reliance, offering a convenient 4-in-1 design that simplifies installation and maintenance. This valve is suitable for plumbing systems and is an essential component for regulating and controlling water flow in heating systems. With its durable construction and reliable performance, the Reliance Valves Easifit 4-in-1 TMV is a practical and efficient choice for any home or commercial heating system.