Pressure sensor. A safety Switch that monitors the Pressure of the refrigerant. A/C ComPressor Relief Valve. A/C Refrigerant Pressure Sensor. High Pressure Cut Off. Air Conditioning (A/C) ComPressor Relief Valve. CUT - Off. HVAC. REFRIGERANT. Included with: AC hose, AC hose to condenser, AC tube, Condenser, Discharge hose, Discharge line, Evaporator hose, Evaporator tube, Front AC hose, Front Pressure hose, Hose & tube assembly, Hose and tube assembly, Lower Pressure hose, Pressure hose, Rear AC tube, Return line assembly, Suction hose.