so i am wanting to buy one of these tanks and a few back up cartos but i can not figure out exactly which cartos to buy i understand that it uses a DC but am i supposed to put a smok in it like the 510 dual coil stainless mega carto or will that no fit i dunno any help please. Then again maybe they need to have the flange in order to lock in. but only ones i can find with the flange are listed as 808 is this the threading on the carto? Or does it simply mean that it is still 510 but has the flange
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