Aspire Nautilus X 4ML Adapter Kit comes with a Pyrex glass tube and a coil adapter. With the kit, you can upgrade the tank capacity to 4ml.

This 4ML kit includes a coil adapter which effectively elongates the chimney into the top hardware. The kit also comes with a taller Pyrex glass which is also compatible with the Cleito. The Nautilus X Coil is smaller so you can fit 4ML of e-liquid inside your Nautilus X tank with this adapter kit.