Chris P. D.:Okay i understand now so let me ask you this? If i wanted to get rid of carrying around my 19cu foot pony bottle with it's own separate regs would it be wise to go with the H-Valve if all i want is a complete set of second regs just in case my primary craps out on me? Or just stick with carrying my pony?
That depends on your intention. If you only want/need a redundant set of regs, then the H-valve is your solution. If you want/need a redundant air supply, then the pony is better--personally, I prefer a larger pony unless it is just a bail-out bottle on shallow dives--mine is an al40.
Another advantage to the pony is one will do, you can take it along with any configuration. The H-valve must be installed on all your tanks, and you can only dive your tanks, unless you relocate some hoses between dives.
theskull