Tassie_Rohan
Contributor
With the exception of OOA scenario, is H valve a good replacement for the pony bottle for recreational divers?
H valves are popular with divers (particularly Europeans) who are doing recreational dives in water cold enough that there's a risk of a reg freezing up and free-flowing.
If you are doing dives that require a redundant air source then, as mentioned several times, a pony or set of doubles is the way to go.