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+glass tank section) and capacity without drip tip and the 510:
3,5ml – 32,5mm, 3,6ml
6ml – 40,5mm, 6,2ml
Spare glass tubes of the earlier version can be used in the DL FL glass tank section.