Caleffi Anti-freeze Valve - 28mm Compression

Anti-freeze valve with brass body helps stop freezing in a monobloc air source heat pump primary water circuit.
Note: Install in a vertical position outdoors with the outlet facing downwards. The valve must be protected from rain, snow and direct sunlight. For the device to work properly, keep the system under pressure at all times, even when the valve is draining.
Opening temp.: 3°C.
Closing temp.: 4°C.