Full-flow antifreeze valve, made of brass. It does not generate any type of load loss. It contains a sensor specifically designed to react to low temperatures, causing a slow drainage of the pipe outward. It operates by opening the flow when the temperature is equal to or lower than 3°C.

When the temperature is equal to or higher than 4°C, this device acts by closing the discharge flow outward. At its top, it has a vacuum control system that allows air to enter the interior when this device begins its discharge.

Especially recommended for aerothermal installations.