Perhaps you are right that I'm mixing up the ST with the Protank (Aerotank, v3) dual-slot.
The original ST base was a somewhat ample single sided triple-hole arrangement. This takes the orig
rba. For a brief time there was a dual-slot commonly available for it (directly from Kanger). It distinctively accepts the
rba (I know, I'm looking at it). Sadly its availability was short-lived. The latter ST2 came with a single-slot then a dedicated dual neither of which accept the earlier RBA. Still have several ST2 DS bases which similarly provide better air dely.
The STM as I recall came with a SS single slot. It's the dual slot for these I'm most interested in. But have a good supply of the post top-fill black and stainless variety. Don't find these to be as consistent a fit or quality as the earlier SS which to me were categorically better.
I've reserved some good stock on Trinity
tanks and STM DS-bases as the glass combo is about one of the best for flavor in moderately low power I've ever seen. I do small twisted-lead TMC singles's on these and use them as samplers for prospective vapers/rebuilders. Spoil 'em early is my motto.
These are my preferred test tanks for recipe development from 17-22W for their accuracy in flavor supplemented by parallels in single coil squonkers for RDA's (identical build usually).
So anybody not using want to sell or trade pls check in with me.
Best of luck all.