"Where your airline comes through the wall & it has that big 90deg curve into the upright...
Feed the curved line into a T instead, that was you can put a drain on the bottom of the drop leg....".
Well, I gave it a shot today and installed the "T" with a drain on it as you suggested. It was a little difficult to separate the HDPE aluminum wrapped hose from the fitting. I finally did and reused it. I think the o-rings on the fitting should be fine.
I also elected to install the moisture trap and regulator at that location as well. I was going to install it at the compressor outside, but thought I would try to get it as far away from the compressor as suggested. Not perfect, but it should be a little better than what I had planned.
I also connected the ceiling hose reel to the system via the HDPE. I had to run in into the attic. What was odd is that both the new hose reels I picked up from HF were identical based on the box. However, I noticed that the mounting pattern was different on the second hose reel. Now I know why. The first hose reel had a 1/4" NPT fitting for the incoming line. The second one had a 3/8" NPT fitting for the incoming line. Odd. I had already went to the hardware store for fittings, so I had to go back as I didn't have any 3/8" NPT reducers. All is well now.
I found a new check valve and installed that on the compressor today as well. I hope this eliminates the leakage and roll back of the compressor after it shuts off.
The only thing I can't figure out now is how to connect the compressor to the HDPE 3/4" line. I see that most everyone uses a rubber pigtail line from the compressor to the hard line (HDPE in my case). I went to a few places today to see if I could find a line like that, but all they could make me were hydraulic lines. No one had NPT fittings that would work with the hydraulic lines. I wonder what everyone else uses? I search the net and see if I can find a solution. I was really itching to fire the system up!
Here's the drain and moisture trap/regulator:
A little cockeyed, but should be okay:
I also outfitted all the Milton connectors to the system. I compared the fittings with my old ones, and the orifices are great a bit larger and should be a nice improvement on airflow:
The entrance of the HDPE into the attic is shown here: