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There are two types of tanks. There are the
clearo-tanks that mechanically are like large clearomizers, that utilize string wicks to draw the e-liquid to the atomizer, like the above mini Vivi Nova. The top unscrews for easy juice filling and cleaning.
The other type of tank is the
cartotank. These use a cartomizer which is a steel tube with polyfill, a center air hole, and the atomizer within it. Holes are either present in the carto when purchased (pre-punched or pre-drilled) or one can purchase empty cartos and punch the holes themselves with a carto punch tool available from online vendors.
The tank is a juice reservoir for the carto, and juice is pulled into the cartomizer with each puff taken through the holes in the cartomizer. The is a slight learning curve involved with cartotanks, and learning how to assemble and fill a cartotank is essential before purchasing one.
Electronic Cigarettes 101: Tank Basics - YouTube
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