Seems no one started a thread of Q&A about the 3.1 clones. Just got mine from FT and came nicer than I thought, with plastic and spare metal tank plus the 510 adapter ring. It was very easy to setup, but I had two problems. 1 with the airflow controller. Seems I screwed it in too much and was making contact with the center column. The thread seems shot, so I'll put in some loctite and make a new thread in the next few days. The other one is the fill valve. This doesn't seem to have a screw (the Tobecco made has one) and the plastic tip doesn't seem to make a seal or is too wide. Air goes in and out, so, I don't know. For now, I'm filling it from the top. The correct one I ordered was this one...
https://www.fasttech.com/products/1494700
https://www.fasttech.com/products/1494700
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