George I was introduced to teflon tape as a thread sealer fifty years ago as you probably were too. Lately I have heard teflon tape is is a thread lubricant and it might seal the threads too. In a perfect world we should not need thread sealer but not many pipe threads are cut perfectly centered with consistent thread depth all the way around, meaning Chinese. I have put together a lot of hydraulic pipe fittings with no sealer and they sealed up just fine but maybe the oil was the lubricant allowing me to get it a bit tighter. Plastic fittings are supposed to not need a sealer but anyone who has pumped liquid nitrogen through plastic fittings finds out the fittings need teflon AND pipe dope together and the fitting might still leak.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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