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At work they just got a "new" air compresser, it looks new, the paint is perfect, but the date on the tank is 1988, the paint is so perfect that there wasn't even a chip on the paint of the drain plug for the pump oil sump---same for the drain petcock at the bottom of the tank, and when forced open nothing came out, there is also an automatic drain ---both drain pipes were so clogged with rust that I had to drill them out.
I modify the drains ---my idea is if they are made easy to use the tank will be drained, I get rid of the old style winged petcock that is normally used, I extend the drain with a street elbow,a pipe long enough that a modern small ball valve with the easy to use lever is in a position that there is no crawling around and fighting to drain it----just lean over and turn the valve