My friend's setup is similar to Wayne's, except his has vertical runs. If the runs were made out of fintube it would cool the air quicker.
Also, sloping the horizontal runs in the direction of airflow would help direct the condensed water to the traps, so compressor connected at the top would be a bit more efficient. Then the takeoff for the hose would be above the final water trap. An auto drain trap for the water at the bottom of your drip leg would be the icing on the cake, so you wouldn't have to remember to drain the drip leg.
Here's a pic of my friend's setup.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.