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OMG - you're right - it's V6H2!!!  I was driving myself crazy with this.  Thanks!!

Here's what I think everyone was running into - myself included.  if you Google "Weil-McLain QMID" you get a link to - what must be - an old PDF with "46H2".   Even AI was saying that it was 46H2.

However if you specifically go to your boiler, then you get a link to a corrected PDF.  Here's a link to the doc.

And here's the doc.