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I used to believe this too.
After attending the Atomic Regulator Technician class last week, I have since found out I was wrong; it will not flood. In the class it was explained, and demonstrated, how it is no more susceptible than any other regulator. The seat saver releases the pressure of the seat, it does not remove the seat from contact.
All my stage regs are Atomic M1s. Just like everyone else, while underwater I occasionally find a reg that has depressurized. The interiors of my M1s show no trace of corrosion as would be expected from flooding.
All the best, James
Have you verified that with a vacuum check? My SP 2nds with seat saver will not hold vacuum in the best breathing setting but will hold it in the hardest breathing setting.