Is it a 22mm diameter? And why doesn't it use a pyrex tube?
You'll have to take that up with the manufacturer. Why do many of the $80 tanks still use polycarbonate tubes?
At least it uses polypropylene (I believe). Website says safe for all tank-cracking juices. Not sure what the diameter is, the one my daughter was using is somewhere in a big box full of vape gear. From what I recall it has the same diameter of the 19mm IBTanks, but don't quote me on the accuracy of that. She got a carto stuck frozen in it and I still haven't gotten it out. It's a rose pink tank (for her pink BB), so since she is off at college and not using cartotanks any longer, I'm not in a hurry to fix it.