The Fernox TF1 Antifreeze Valve is specifically designed to protect water-based air source Heat Pump heating systems. In cold weather when temperatures drop, systems that are not treated with a glycol-based fluid can freeze within the heat pump circuit potentially causing harmful and costly damage to vulnerable heat pump components and system pipework; eventually causing premature breakdown and repair. The Fernox TF1 Antifreeze Valve is an essential, simple to install component developed to prevent frozen systems by detecting when the fluid in the circuit is close to freezing point i.e., when the circuit temperature reaches below 3° C. The TF1 Antifreeze Valve will automatically open and release system water, preventing ice from forming within the Heat Pump system and safeguarding the operation of the system. A high-performance antifreeze valve specifically designed to protect water-based Heat Pump systems. Manufactured from brass for robust, durable and long-term operation. Industry leading KV values for high performance. Automatic operation when the circuit temperature reaches below 3° C. Supplied with both Male and Female BSP connections for ease of installation on the flow and return pipes. Available in different sizes to ensure full compatibility for multiple applications.