This is a tank section, you need a Dvarw DL FL deck to have a working tank. And you need a glass tank section if you want glass, a spare glass tank cannot be used with the ultem tank section and a spare ultem tube cannot be used in the glass tank section.
Comes with 2pcs spare black silicone rings.
Total length of the tank (deck+ultem tank section) and capacity without drip tip and the 510:
3,5ml – 31,6mm, 3,5ml
6ml – 39,1mm, 6ml
Pc or ultem spare tubes from the earlier version can be used in the DL FL ultem tank section. You will want the ultem if you use tank cracker juices, like cinnamon, strong menthol, citrus, cola, etc.