R134a
R134a
R134a
r134a
You need to include a model. It's not going to be the same for a Volvo car as it is for a Volvo semi truck.
R-134
r 134-a
R-134A
r-134a
it uses R134a refrigerant
134a is the refrigerant used by most vehicles made after 1995
It's refrigerant, and it would be an R134a quick connect coupler.
The A/C uses R-134A refrigerant.