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Here's the question I've been pondering.
In technical courses that include valve drills you'll be asked to shut off avalve and breathe down the reg.
I've been told by almost every dive shop I've been to that you never want a first stage to lose pressure under water by shutting off the valve because it will flood and need to be serviced. Not to mention the SPG may be damaged.
What's the truth of the matter? Are there some first stages that won't flood, brands? I am of course assuming that all the first stages we're using are sealed envirionmental types because in the midwest the water is usually cold.
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