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INAIL (ISPESL) qualified safety valve. 3/4"F x 1" female-female threaded connections. Fluids used: hot water, air. UNI EN 12165 CW617N brass body. Knob in ABS. Steel spring. Temperature range 5÷110 °C. Nominal pressure 10 bar. Opening overpressure 10 %. Closing waste 20 %. Compliant with the "PED" 97/23/EC directive. Factory setting 4 bar.