Expand your Nautilus X with this new 4ML adapter kit. While many people have enjoyed the shorter, low profile Nautilus X with 2ML Pyrex tube, many customers want to upgrade the tank capacity to enjoy this product without the need to refill as often. This Nautilus X Adapter kit is the simple solution. The capacity of your Aspire Nautilus X is increased by replacing the standard pyrex tube with the longer one included in this kit. Next the included coil adapter is fitted in place (effectively elongating the tank chimney) and everything is reassembled. Now you have double the liquid capacity. A quick, elegant and simple solution for those of you who would enjoy a larger liquid capacity.