The OBS Crius Sub-Ohm Rebuildable Tank is an RTA with a dual coil build deck. Its design was planned over a long period of time with the purpose of having the best RTA ever. It was made specifically with the rebuilding enthusiast in mind, not for the novice vaper.
The Crius is made of a stainless steel and a pyrex glass tank. To fill, simply lift the top cap to reveal the large side filling port. Turning the base allows control of the massive airflow holes, as well as opening/closing the juice channels for wicking.