VTEC_ wrote:

I like how Ulton took an interesting approach with accessories. Although, at $21 it's cheaper to buy the Coppervape and optional cap with 3 color choices if the single block off disk isn't wanted. Air travels path of least resistance so using an MTL disk paired with the 1.6/1.9 disks should equal very similar results.

True, but what if you want a more restricted MTL?
I believe that is what the solid block is for.