Here is exactly what I used from Eastwood:
https://www.eastwood.com/master-garage- ... e-kit.htmlI should have said 80 lbs/ft^2 to get my units right.
The line up the wall and over the ceiling to power the lift stops is 1/2" PVC with only 80lbs/ft^2.
Really small PVC pipe like this is plenty strong --- I would not want to put 200 lbs/ft^2 through a 2" PVC pipe!
The Eastwood couplings do not appear a good as the ones in the first web page that I sent you.
But I think that Eastwood is 1/2" and the others were 3/4". If you run separate 1/2" tubes all the way to the compressor they work fine. I takes a lot of air for my blast cabinet and a lot of air for some of my air tools, and the smaller tubes work out fine --- but I should double check that they are indeed 1/2" .
I just looked at Eastwood and they are only 3/8". But they do work OK, though 1/2" might be better. If you had only one main line with sub outlets, then this main line would have to be bigger than 3/8" I guess, but I have three 3/8" tubes running all the way back to the compressor.
The setup I used 12 yeas ago had just come on the market --- or just a few years before. I would now look around to see if I could get a little better connectors without doubling their price.