I guess I didn't read all the fine print. I got 4 T3S clearos because I like the T3 for away from home and I thought the ProTank coils would work with them, thereby simplifying my rebuilding regimen. Wrong. The Evod/PT coils don't fit in the T3S, the metal ring near the base is too large to go all the way into the T3S. I thought about grinding down the base ring on the PT coils to fit the T3. While probably workable, it would be a hassle. On a whim, I tried one of my old style T3 bases in the T3S tank. It fits and works well, so far. So I will be using the old style coils in my T3S's. Since I have 20 or more of these coils I'll get by until Kanger settles on ONE coil for their product line, or something better comes along.