I'm building a test stand at work for some of our air powered spindles. I had everything plumbed out to the Filter/Regulator/Lubricator, assembled up and teflon taped and ready to put the pressure to it. All 1/2" fittings and hoses so we won't have any issues with flow on the supply side and it will flow a whole buncha air.
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Walk back over to the compressor, start opening the ball valve, hear air hissing out like a mother near the test station. Did I mention that 1/2" lines will flow a shit-ton of air? Go back over there, double check everything. Make sure all the compression rings for the bowls are tight, fittings are good, regulator is engaged in the threads, etc. One of the bowl rings was snug but not tight, so who knows, tighten it up and give it a shot. Open the ball valve again, more massive hissing. WTF. Of course by the time I can get 40ft from the compressor to the FRL unit, all the pressure is released, so I can't even tell where its coming from, and its too loud and intense to just leave the valve open and let the pressure build up fully. I double check all the same stuff again, try it again, same result. Ok, it's time to get serious. It is all run with rubber airline, so I dismount the FRL from the wall, and carry it over to the compressor. Crack the valve open and air is just pissing out around the back of something. I flip it over and very quickly realize why.
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Guess that's what that "extra" 1/4NPT plug in the box was for 
