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The core I put in my 90 didnt have welds. Im pretty sure they were o-ringed, and then pressed in and then they folded over some of the housing metal to "lock" the pipes into place. They would move around a little as I was putting the hoses back on. I even took it back out to make sure I didnt over bend anything on accident. Hasnt leaked in a couple years, so must be OK!
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