Macon non-electric, side-mount angle, thermostatic radiator valve with a 1/2" female IP x 1/2" male union nut and nipple. These straight pattern valves can be used with remote operators or built-in operators, but when using the built-in operator, turn the valve so the sensor is on the side rather than the top to prevent ambient temperature rising up into built-in operators as they also contain a temperature sensor.