Answer: regulator

AnswerCrossword Clue
REGULATORControlling device.
REGULATORScuba device
regulatora. governor mechanism for regulating the flow of fuel, steam, etc., to an engine in order to maintain constant speed under varying load or resistance b. valve for regulating the pressure of flowing gas or liquid to maintain a predetermined p
regulatorone who regulates
regulatora. adjustable device in a clock or a watch for making it go faster or slower b. master clock, usually of great accuracy, against which other clocks are checked
regulatorperson or thing that regulates