Abstract: A mixer unit with thermostat controlled valves for mixing hot and cold liquid includes a housing with valves for supplying the hot and cold liquid to the housing. The housing includes a mixing chamber which terminates in a discharge spout. A yoke is rockably mounted in the housing and the ends are arranged to make contact with and actuate the valves for the hot and cold liquid. A bimetallic spiral control thermostat is carried in the discharge spout and cooperates with the yoke for causing rocking movement of the yoke when the thermostat spirally moves in response to regulation of the thermostat. A device is carried at the outer end of the discharge spout for adjusting the position of the spiral of the thermostat about its axis of symmetry and thereby regulating the desired temperature of the mixed liquid.