I personally like the one you can get with ProVape. It does not taper to match the
kayfun precisely but the stainless matches the finish of the satin silver better. Also it has air channels in it so you can actually use it to help with attys like the ProTank with airflow issues.
I also got the
svoemesto ProVari ring from the classies which does taper to the exact dimensions of a
kayfun. Although it provides a flusher fit there is a slight taper to the ring, which I'm not a big fan of, but more importantly, the stainless doesn't match the finish of either my Kayfun clone or the ProVari as well.
But both are very reasonable at $8.00 and I think you'll be happy with either one.
Vaperev Shop - Kayfun PV Cone
ProVape ProVari Tank Ring
The Mini on the left has the Provape ring while the standard on the right has the one by SvoeMesto.
