This thermowell comes with two o-rings, an oversized washer and a nut. If a large washer were welded to the thermowell a watertight seal could be obtained, but in this case the solid washer will butt against the threaded end of the thermowell. If one of the O-rings is placed between the washer and the face, the washer will simply jump over the face of the sleeve when tightened. If there is nothing between the washer and the end of the thread, no matter how good the seal is between the tank wall and the nut, the seal behind the washer is imperfect and leaking. There is also a sharp fragment inside the protective tube. made of steel that was left loose, which hurt my finger. I've tried teflon tape on the end of the thermowell threads where the washer sits and am currently seeing if that prevents leaks.
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