large. W/O AUTO TEMP CONTROL. 13.4mm. A seal that prevents oil from leaking out, or contaminants from enteRing the Air Conditioning Evaporator Core. A/C Expansion Valve O-Ring. A/C Line O-Ring. A/C Refrigerant Line O-Ring. ''O'' - C. 'O' - Cooling Unit. AC tube o -. Air Conditioning (A/C) Refrigerant Line O -. Cooler pipe o -. Evaporator Core o -. Expansion Valve o -. Return hose o -. Suction Line o -. Included with: AC & heater assembly, AC tube, Evaporator tube, Front Suction Line, Rear Suction Line, Return hose, Suction hose, Tube assembly.