Hmmm I just looked at the listing for my ViVi that I bought last night and my listing doesnt say that
http://altsmoke.com/vision-vivi-replacement-coil-tank-kit.html
All that is included is the AltSmoke package is
1x - 3.5ml Clear
tank or 2ml Clear
tank Complete with 2.4ohm Short Wick Head
1x - Your Choice of Replaceable Coil Head - Long Wick
1x - Your Choice of Replaceable Coil Head - Long Wick
1x - Display Box that holds everything listed above.
The reason I even knew about the Sleeves was from a HealthCabin recommendation for them. Where did you get your Nova kit from? Some places repackage them and include or dont include certain things. One of the reason I went with Altsmoke besides their lower price was because they allow you to choose the resistance of all 3 heads instead of you getting 3 different Ohm heads like in the normal kit.
First let me say you dont NEED the sleeve, it is mostly for looks and offers a tiny bit more support to the bottom of the
tank and takes a tiny bit of stress off the battery's threads. But I am thinking 1 of 2 things. Either the place you got your kit from included the little sleeve which wouldn't be a shock since they are <2 dollars when you buy them in bulk. Or what they are describing as the "Ego cone" is actually just the bottom metal fitting of the Nova tank.