Gary Slusser
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I don't know how or why but I didn't see the OP's posts #5 and #11 until now. The tank threads are split in a valley of the threads in two places 180* across from each other. It could be due to stress on the control caused by the bad plumbing or tightening the tank after it was installed. My guess would be the stress of the bad plumbing since rotating the tank to tighten it another 3/4 turn was done while the bad plumbing was stressing 'things'. Otherwise the control valve would have been rotated instead of the tank. But... the cracks don't go through the neck to the outside unless the crack is so narrow it can't be seen or, because the control valve is not screwed into the tank now, so screw it in use a magnifying glass to look for the crack.
What to do is a problem, the tank is under warranty but not covered if the valve was tightened too much, and... if it was the stress from the bad plumbing, the plumber won't make it right. So I suggest going to the seller (and remind them that they said to rotate the tank another 3/4 turn) and explain what happened and see what they say. They are the only one that could get a warranty replacement anyway. That assumes the plumber won't buy a new tank for his customer on the very likely chance he did cause the cracks. You could ask him for a new tank and you change out the resin and redo the plumbing instead of having him doing it.
Resin normally has a 50%+/- moisture content, even new in the bag, and if it dries out, that ruins the resin.
What to do is a problem, the tank is under warranty but not covered if the valve was tightened too much, and... if it was the stress from the bad plumbing, the plumber won't make it right. So I suggest going to the seller (and remind them that they said to rotate the tank another 3/4 turn) and explain what happened and see what they say. They are the only one that could get a warranty replacement anyway. That assumes the plumber won't buy a new tank for his customer on the very likely chance he did cause the cracks. You could ask him for a new tank and you change out the resin and redo the plumbing instead of having him doing it.
Resin normally has a 50%+/- moisture content, even new in the bag, and if it dries out, that ruins the resin.