BOILER SAFETY DRAIN VALVE FOR USE WITH ULTRASTORE WATER HEATERS. TECHNICAL SPECIFICATIONS: PUMP PRESSURE MAX. 2.8 BAR SYSTEM PRESSURE MAX. 4.5BAR CLOSING TEMPERATURE OVERAPPROX. 7 °C (AMBIENT TEMPERATURE) OPENING TEMPERATURE BELOWAPPROX. 3 °C (AMBIENT TEMPERATURE) OPERATING TEMPERATURE -30°C – +80 °C WEIGHT 200G THIS VERSION USES 10MM FLEXIBLE HOSE CONNECTIONS.