Pony Manifold Bar?

[FFMDiver]

With the premise of avoiding the "your an idiot for using a pony" argument, can anyone tell me if a Manifold Bar exists that can switch on a pony bottle? (I'm looking to avoid the $500 switch block).

 

[Bob3]

I seem to recall a gizmo that tied into a reg's HP port or something like that.
I never paid any attention to it because something like that would screw up the whole idea of using a bailout in the first place, that of having an entirely redundant air supply with its own reg.
Main reason for carrying a pony is for gear failure [reg-pressure gauge], not doing the "running out of air" thing.

 

[FFMDiver]

That would be the RSV-1 Redundant Supply Valve.
Thanks.