The iStop antifreeze valve allows the circuit medium to be drained when the temperature reaches an average of 3˚C. This prevents ice forming in the circuit of a system, generally with a heat pump, avoiding potential damage to equipment, valves and pipework. The valves are suitable for a variety of fittings and pipes connected by a union.

• 28mm Compression connection
• Opening temperature: 3 °C
• Closing temperature: 4 °C
• Temperature range: 0–65 °C
• Ambient temperature range: -30–60 °C
• Max. working pressure: 5 bar