Altecnic Safety Relief Valves Series 311 This product is designed for use in conjunction with heating systems and water supplies to protect the equipment and the system against damage from excess/abnormal pressure increases. Features and Benefits: Size : 1/2" x 1/2" Series Type : 311 - F x F Pressure Setting Bar: 3 Weight kg : 0.13 Box quantity: 50 Diaphragm Type Safety Relief Valve 2.5, 3, 6, 7 and 8 Bar Maximum Temperature 110°C