Transducer. A safety switch that monitors the Pressure of the refrigerant. A/C Refrigerant Pressure Sensor. High Pressure Cut Off. Pressure Transducer. Right Hand Drive. Air Conditioning (A/C) Refrigerant Sensor. Discharge line valve. High CUT - Off SWITCH. HVAC Switch. Transducer. Included with: Tube assembly, Tube assy.