Yup, the yellow thing is used to plug off pipe fittings when testing tanks for leaks. I almost got blown off the top of a 400+ barrel tank when one of them flew out out a tank that was being pressurized with about 1 1/2 or 2 PSI. 2 PSI doesn't seem like much but 2 PSI inside a 20,000 gallon or so tank is a heck of a volume of air to come out of a 4" opening. You'd swear there was 150 PSI in the tank! The tank I was on top off was 40' away and the plug blew right over where the ladder was. About a minute before it blew, I was at the top of ladder climbing on the tank to weld the fittings. It shook the tank when it blew past.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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