A/C Coupler O-ring: Description and Operation

O-Rings







O-rings seal connections between A/C system components.


NOTE:
- Always use correct size O-rings (dimensions -a- and -b-).
- Do not reuse O-rings, always replace. Use only new O-rings that are compatible with R-134a refrigerant and refrigerant (PAG) oil on R-134a systems.
- O-rings for use only on R-134a systems may be color coded: red, green, violet or black.
- Lubricate O-rings with the appropriate refrigerant oil before installing (only use PAG oil).