A very common example is when you are diving that grit gets stuck in the BC inflator hose (male) - LP hose connection (female), here you will get a free flow, either inflating your BC or just blowing lots of bubbles. You should have been shown in your OW class to remove the LP hose from the BC (by pulling the release on the hose that is attached to the BC, not unsrewing it from the reg) and orally inflate the BC - i believe this is in the standards of most agencies.
If you are on the surface, by all means just pull the LP hose off the BC hose or turn off the valve if you so wish, but UW lets just leave it on unless we have some additional back-up.
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Turning a valve off wont fix the cause of the problem, only the effect/symptoms - free flow, you still have to clear the grit or whatever out of the hose assembly or fix whatever else is busted on it. Try not to remove hoses UW either, that would be a recipe for losing air very quickly.
Having dove with Charlie, i dont think his regs are defective, nor would i believe he would skimp on keeping them in shape, nor needs to replace them.
![Winking :wink: :wink:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
The attachment he is talking about is the one to the BC hose (female end), not the reg connection (male end) which requires a wrench. If the end that connects to the BC hose is too fiddly its harder to remove it if needed. I think what he is mentioning is a large flange or a large gripable section (have seen both) that sits on the hose side of the female connection piece, i cant find a picture at the moment.