Yes, I think you all are correct. Van with the corrosion resistant part and ifixoldhouses with the rigid copper part. There are two types of copper tubing . Hard rigid and the soft roll type. The video that I am referring to uses a straight pipe with no bends. If the same video vaporizer had used the rigid type 1/4, it probably would have not bent so easily or at all. I am not downing the maker of the knock off vaporizer, it is a good unit with only this one problem as far as I can tell. Perhaps the builder will correct this in the future if he has not already. I admire his ingenuity. Though I have not seen this knock off version in person, or the provap, or even the Original european version, with my own eyes, but only on the net and videos. I am in the process of building one myself. Actually I have already built one that I love and have been testing, and happy to report so far it's flawless. I have made this known to Mr Van a while back privately. There are some things to consider and look into before releasing more information. I am excited about this achievement to say the least.
Phillip