Brass forge straight dualvalve and elbow dualvalve ,plated nickel Size: 3/4"M x3/4" F Character: Energy saving up to 10% Simple connection and maintenance Mateiral: CuZn40Pb2 or CW617N Installation: The valves should be installed at the entrance and exit of the heating medium for the installation of the heater. They allow removal of the radiator without draining the entire heating system. There are two kinds of the brass dualvalve. 1) STRAIGHT dualvalve Size: G 3/4“M x G 3/4"F 2) ELBOW dualvalve Size: G 3/4"M x G 3/4"F