I have requested "A" and they are thinking about it but they haven't been selling enough Divers to justify the expense yet. I don't think many people know they carry the Diver yet.
"B" they have tried to get the non-flanged Diver but they are hard to come by.
I would like to amend my post. I asked Phiniac if they could make a recessed bottom cap for the flanged Diver and they did think about it and made a prototype which I am testing as I type. The Diver fits perfectly flush with the bottom cap and no leaks, not that I expected any from a Phiniac tank. So now they are waiting on the machine shop and will have some recessed caps as soon as they are done. Know that these caps will only fit on Phiniac tanks or tanks with the same ID.
I have Phiniac's and Konstantino's permission to mention Phiniac info about the Diver.
to pull the cup out. The trick is to place the pliers so they close at the base of the slotted side in the cup. If you do it the other way you'll break the cup at the slots. I don't twist much because that can break the ceramic post. I just twist very slightly and pull and it comes right out.