I hope the ring gives the draw you want, but wanted to mention one OTHER option that I've got in play.
The SnP tank, with the built-in ProVari "collar/ring".
It works for me as an AIRFLOW CONTROL.
It screws "up" onto the tank - but if you UN-screw it, it will move lower and reduce airflow as you go - I literally can adjust the draw very carefully this way!
It's pricey - but it's also a FANTASTIC carto tank in every way...
You can see here, on the right, it's "open" on the left, it's "closed" - that would be almost impossible to draw air through...
Thanks for sharing this, Train! I really love IBTanked, but it would be nice to have some built in air flow control that didn't involve loosening the 510 connection.
In the end, though...the air flow on the tank itself is fine. Provape should have just made the Provari's end cap flat. If it weren't for the silly tapered top cap I wouldn't have wasted $50 on rings that don't fit my needs.
It's good to know I've got good looking options for an alternative tank. That looks awesome!
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