In reply to Russ, if you had done research like you claim to have, you would have found that that small change in design (a byapss through the center of the valve)makes a huge difference in how the valve can be used. A big enough difference to patent I might add. They do work and I have used them for over 20 years on three different submersible wells, one with a heat pump on it. They do exactly what they say they will do, no smoke, mirrors, or snake oil involved.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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