It turns out that the (upper or lower) stainless 22mm tank rings from a fasttech Kayfun Lite clone work great as a beauty ring for the Sig Zmax. The ring replaces the Zmax top cap. I wasn't using the tank rings on my KFL, since I bought a PMMA tank section instead. The ring needed to be shortened by about 1/16". I used a piece of 400 grit sandpaper placed face up on a flat tabletop and, holding one end of the ring, pushed it down keeping it flat on the sandpaper while moving it in a circular motion, until it was the just right length (slightly higher than the top of the 510/ego connector). By the way, this only works for 22mm atomizers. The ring is held in place by the atomizer and is not screwed onto the Zmax topcap threading.
The two rings taken from the KFL on the right, which now has the PMMA tank:
Airflow on the Zmax isn't significantly decreased with the ring in place, but a small air hole can always be drilled on the side if needed.
I used the second ring as a slightly taller beauty ring, to use with my IBtanks, which create a larger gap with the Zmax, due to the flanged cartos and beveled caps they use.
Total cost is about $16 plus you get a great KFL to use on your Zmax...
This $14 KFL clone will work.
$14.39 Kayfun Lite Styled Rebuildable Atomizer (4.5mL) - clear tank section at FastTech - Worldwide Free Shipping
This is the KFL tank I have. It's a matte finish, but I brushed it out. This has an airflow control which the other one doesn't have.
$16.59 Kayfun Lite Styled Rebuildable Atomizer (4.5ml) - clear tank section / matte surface at FastTech - Worldwide Free Shipping
PMMA tank:
$1.32 Replacement Polycarbonate Tank for Kayfun 3.1 / Kayfun Lite - black at FastTech - Worldwide Free Shipping
Nano kit:
$5.19 Kayfun Nano Body Kit at FastTech - Worldwide Free Shipping

The two rings taken from the KFL on the right, which now has the PMMA tank:

Airflow on the Zmax isn't significantly decreased with the ring in place, but a small air hole can always be drilled on the side if needed.
I used the second ring as a slightly taller beauty ring, to use with my IBtanks, which create a larger gap with the Zmax, due to the flanged cartos and beveled caps they use.
Total cost is about $16 plus you get a great KFL to use on your Zmax...
This $14 KFL clone will work.
$14.39 Kayfun Lite Styled Rebuildable Atomizer (4.5mL) - clear tank section at FastTech - Worldwide Free Shipping
This is the KFL tank I have. It's a matte finish, but I brushed it out. This has an airflow control which the other one doesn't have.
$16.59 Kayfun Lite Styled Rebuildable Atomizer (4.5ml) - clear tank section / matte surface at FastTech - Worldwide Free Shipping
PMMA tank:
$1.32 Replacement Polycarbonate Tank for Kayfun 3.1 / Kayfun Lite - black at FastTech - Worldwide Free Shipping
Nano kit:
$5.19 Kayfun Nano Body Kit at FastTech - Worldwide Free Shipping
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