Stop in for a cup of coffee

Might consider a little in-line lubricator for those solenoids and air cylinders also. There are chemical in-line dryers also, very effective and don't barf water allover the place when you least expect it.
Dessicant air dryers need maintenance. Forget and the result is far worse than having nothing at all.
A water trap can be made from copper pipe and a few fittings and a valve.