JamesBon92007
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James, there is nothing wrong with a Sherwood Magnum. I own one myself among my collection of regulators. The problem is that in the older models the positive pressure was handled through a filter in the piston. This was a carry-over from the early days when they press-fitted the filter on the piston so the piston would be changed on every overhaul. If the filter gets plugged then the piston needs to be replaced, which is a problem because Sherwood doesn't make that part anymore. I had my piston replaced as did many other divers. The newer versions are better because the filter was moved to the body and can be replaced. The latest version uses a Schrader valve which is even better. So the OP needs to have some knowledge of the Sherwood line.
OK, but how does the filter get plugged if it is "positive pressure?" Even if the one-way valve failed it seems to me that water could not/would not enter if the first stage was pressurized. By "plugged" to you mean by corrosion or some foreign contaminants?