With this Replacement Pyrex Glass tube, you can easily replace the worn or broken glass from your Aspire Nautilus tank. It simply screws into the mouthpiece base at the top of the tank, and into the connector base at the bottom of the tank. The glass features the Aspire Nautilus logo, there is also the measuring scale from 1 to 2ml so you can see exactly how much e-liquid is in your tank.