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The compressor intake is 1/2". The mixer and tubing is 3/4". I am in the midst of modifying it a little to shorten the length of hose between the mixer and the compressor. I haven't noticed any drop in the performance of the compressor. I also didn't see any difference in the temp of the heads. The highest I ever saw was about 180 degrees when I had a really rich helium mix. Around 70%, but that's another story 
The temps are usually in the 160 to 170 degree range.
btw, a 6 element is all that is really needed, so my stick is a little overkill. These things are really designed for fluids and other materials that have much higher viscosities, so I'm not too worried about increased resistance.
The only reason I used one is my time is worth a lot more to me than the time too build one from scratch. All I really have to do is screw the threaded ends together and drill a couple of holes in some PVC plugs. It was a no brainer for me to select the easier route.
The temps are usually in the 160 to 170 degree range.btw, a 6 element is all that is really needed, so my stick is a little overkill. These things are really designed for fluids and other materials that have much higher viscosities, so I'm not too worried about increased resistance.
The only reason I used one is my time is worth a lot more to me than the time too build one from scratch. All I really have to do is screw the threaded ends together and drill a couple of holes in some PVC plugs. It was a no brainer for me to select the easier route.
Uncle Pug:
