I want to recharge the refrigerant in my auto air conditioner. I've
assembled all the necessary tools except for one item. My vacuum pump
is outfitted with a 3/4" female NPT fitting and the discharge tube
from the gauge set is a R134a female fitting. I plan on machining an
adapter to get the 2 fittings connected to each other.

But I can't figure out what the thread size is on the R134a. Please
enlighten me!


Gary