AC tube o-ring. PartQualifier: small. small. A/C Line O-Ring. A/C Refrigerant Line O-Ring. HVAC Case Seal. Instrument Panel Air Duct Seal. ''O'' - C. 'O' - Cooler Pipe. AC tube o -. Accumulator o -. Air Conditioning (A/C) Refrigerant Line O -. Dehydrator o -. ExPansion valve o -. HVAC Case. Instrument Panel Air Duct. Outer. Pressure Line. Included with: AC & heater assembly, Condenser, Condenser assembly.