Anyvape CVI, out of stock everywhere, will work. But, regardless of any of the others which I haven't tried, if the knurled bottom of the T3 is covered by the "well" you need to be cautious when removing the T3. Otherwise you might spill your juice. The new CVI's have a removable top cap that gives you access to the bottom of the T3 now. For this reason I always use the 510/ego adapter on my early version CVI which kinda negates the "anyvape" concept. The only problem with the adapter is it makes for a little airy draw, but, still acceptable to me. Others have covered one or two of the T3 air holes with nail polish for the airy problem.