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I use a PVC fitting to go from 3/4 npt to 1 1/2 PVC and then a fernco from that to my shop vac. Yes I have to tighten a hose clamp but it's an air tight seal in the end.

https://www.harrisweldingsupplies.com/harris-safety-silv-56-brazing-kit-56kpop/

I am interested in both the new leader Vermonter pan and the Mason raised flue pan. I have talked Bill and leader, but I'd like to hear more feedback if possible.