Originally Posted by
Oldtimr
Oldbob, take a piece of pipe, put pipe caps on it if you like, put it in the freezer for a day, then take it out and let it sit in a heated room for a couple of hours, take off the caps and look inside the pipe, you will see moisture. Moisture is in the air, there is air inside your barrel unless you live in a vacum. when warm temp hits cold steel, moisture is the result.
Oldtimr,
There's an experiment I can do! I'm about to reroute some plumbing. All I need is an end cap. I won't seal the threads. I need to do some measuring before final assembly, anyway. Might do it this weekend, I'll report back.
OldBob