That's a dual coil
tank. You cannot use it as a single coil simply by just installing one coil/wick because the
juice wells where the other coil should be installed don't have wick to absorb the
juice in these well.
There is a solution to turn this into a single coil tank. Easiest solution is to go to Walmart and buy their
Equate brand of moldable silicone earplugs and use a piece of that to plug up both the juice ports and air intake where the second coil should be. It won't be the most flavorful tank, but it makes it a vapable single coil tank.
I'll post a picture soon of what I mean.
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Edited to add:
Here's the pic. As you can see both of the juice wells and the air intake on the one side of the deck are all completely plugged up with once piece of moldable ear plug. It's not even a whole ear plug, just a part of one. Breaks apart like play dough.
It's important to plug up the air intake and not just the juice wells because that extra air coming into the tank on the side where there is no coil will really kill the flavor.
Authentic Velocity plug shown below doesn't fit the D2's deck because juice well and air intake dimensions are too different.