I go by TP Tools & Equipment's recommendation for Air Line Hookup - Metal Piping Diagram.

I bought brass shut-offs from Harbor Freight.

My air-supply system has a cheap moisture separator. And, I have a refrigerator/cooling separator when it gets real humid (not very often) or when I am using the blast cabinet. I paint with a turbine HVLP system, so there is no need to worry about moisture when painting.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.