It also depends on what regulator you have some Auqalung regs have their auto closure device that seals the opening off when no cylinder is attached so if working correctly no water will get in anyway.
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This is just another great reminder that "soaking" regs is always a bad idea...
When I dive in clean fresh water, I only rinse my regs afterwards and may not even do that if the water is clean enough. I only soak after salt water trips.
I have the Legend LX. Bought brand new.
Please ignore this bad advice, unfortunately from a certified technician. Soaking a regulator in fresh water after salt water use is the only way to get salt out of exposed threads, which practically all regulators have, included environmentally sealed regs. Dried salt water is the number one cause of corrosion in regulators. It's very important for the long term health of a regulator to not let salt water dry on them. Soaking in fresh water is the only way to get it all out.
You just have to remember to install the dust cap. It's really not too much to ask. And honestly, a little fresh water in the HP section probably won't cause too much of a problem. It might gunk up the filter.