Another variation could be holes with plugs near the top realm of the tank in the polycarbonite (pc) body.
Sure these are not polypropolylene (pp) tanks? Anyone?
I've heard pc has an issue with disintegrating while pp does not. Greenhouseone said their smoktech tanks are made of pp. I've had nothing but issues with the smoktech ones (the hole in the cap is too tight, this makes the carto rip the cap, leaving shreds of plastic, then I get a burnt plastic taste and a dizzy head after inhaling... definitley doesn't seem to safe, and loose caps and leaking issues on top of that).
So I'm hoping these are made of pp. I have one of them already and it's been awesome, way better than the smoktech one. No leaking - all the parts fit perfectly, this is a great tank. But is it made from pp? I have a bunch of menthol ejuice on order and I was looking forward to putting this in the tank. Only, if the tank is made of pc chances are it will crack from the menthol.
Anyone have experience putting ejuice typically associated with cracking pc into this tank and having any issues? If there are no issues I would assume the tank is made of pp... I really don't know of any other way to tell.
But overall, awesome tanks - really liking my DCT's, while the smoktechs are in the garbage after one use.