Thanks for your help on this subject you have been very helpful.
My remote reservoir hydro booster has a 9/16-18 and a 1/2-20 out port and I have 4 wheel disc brake system installed on my 49 chevy truck.
It looks like inverted flares on the out ports are the same size but have different thread sizes.
What would be the purpose to have them two different sizes?
THANKS :p :p :p :p