I made mine out of black pipe from HD and it’s working well. I get a little mist when I drain the input leg but never anything when I drain the output leg.
I also built a huge dessicant drier that goes onto the back of my plasma cutter using a water filter housing and a piece of pvc pipe. After several days of cutting I’m starting to see some pink at the top of the dessicant but there’s pounds below it that are as blue as new. I added a piece of Scotchbrite on top of the beads to keep them from dancing.
My air is cleaner and drier than a lot of paint & body shops I’ve seen.