Originally Posted by kevs79
Is that 1/2 copper tubing? Are there 4 valves on the wall(1 in each "u" and 1 on each drop at each end?
Yes, you're correct on both counts.
I used (expensive) ball valves like these ones on each of those 4 locations, and came up with a conglomeration of sweat-on fittings (don't trust compression fittings with 125 PSI) with swivels to allow for dissasembly if needed.
I pretty much cleaned out the local plumbing supply ...
A little later on, I found some sweat-on mini valves and used them for the outlet drops. Yes, every outlet has a drop and a ball valve so that moisture can be ejected.
Maybe I'll take some more pics after I clean up my messy garage. LOL