[GMC69]

Yes the valves are 1/4". When I air up the truck I am using 2 valves at a time. So 2 valves are pulling from a single 1/4" feed from the tank. Whereas if my feed line from the tank up to the valves is 3/8" then from the 3/8", splits into the 4 valves, I'm then feeding both 1/4" valves with the 3/8" line.

Curious if anyone tried the difference between a 1/4" feed line vs a 3/8" feed line when operating more than one valve at a time.