The Conant Control Vent Selector Valve can accomplish in one valve what until now could only be achieved by using a number of selector valves. It can operate any one control valve while simultaneously venting to the atmosphere all the remaining valves connected to it. There are two series of Control Vent Valves: Series 180, which offers 180° rotation for servicing up to three control valves, and Series 360, which offers 360° rotation for servicing up to four control valves.