J75
Contributor
I use a Conshelf on my stage bottle. Those things are indestructable and will be around forever. Pretty much any dive shop can service them, and they have been a popular choice for classes due to their dependability even when abused by students. So when they're taken care of properly, they're great. I am curious though as to why they're your "older" regs. If they were no longer treating you well, then you might want to cosider going with something new. IMO, your pony/stage reg should be just as good, if not better than, your primary reg.