I've read in several places now that the MacTank uses the same coils as the iClear 30S, though the iClear cartomizers do *not* fit the mactank, at least not straight from the factory (if there's a way to rig 'em, please, lemme know, but I'm not seeing it). Actually looked into this quite a bit trying to replace my mactank's cartomizer in-town (without luck)