Mike Wallace mentioned this as well.  You've both got a good point.

Lee

Kenneth Smith wrote:

> There are shops ( I can name at least one here) that had major moisture
> problems in its compressed air systems. The quality of the  moisture
> level is only as good as the maintenance of the air system. If an air
> filler is pumping water into the tank along with the air all bets are
> off with respect to internal rust on steel tanks and some corrosion
> (Al02) on Al tanks.