First things first, the Zenith has one of the best filling mechanisms I have ever encountered on a tank. The top-cap slides open with a small twist, giving way to a beefy fill slot, while at the same time functioning as a liquid flow control mechanism. And this is a big deal. The Zenith will not flood, and you will not have to use any of the tricks you have become accustomed to in order to avoid gurgling and spitting on the first draws. (I’m talking to you, Nautilus 2.) I haven’t had even the tiniest bit of leaking, and the tank has been performing flawlessly after every fill.
The main part of the tank is one piece, with only the top cap and the airflow ring being removable. One disadvantage to this design is that you can’t really take it apart to clean the tank. You’ll have to remove the coil, let water run freely within, then blow out the excess water, and let it dry for a couple hours. Another potential issue comes from the fact that the glass part of the tank is built inside the metal part of the main body. This means that you can’t replace the glass if it breaks. You either have to be careful or use a vape band.
The Zenith has five airflow holes, each with a diameter of 1 mm or so. One hole gives a smooth and slightly loose MTL draw. With it fully open, it will perform between a very loose MTL and a very restricted direct lung (DL) draw, depending on the coil used.
In the box, you will also find a thank you card with a QR code, which leads to a page with video tutorials by Phil Busardo. Thumbs up to Innokin for these videos, which will be a real help for new vapers.