jadairiii
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......What I am wanting to know is how often has/does a regulator actually fail? ....
Problem with your question is it does not take into account manufacturer/model. Most well maintained regulators don't fail, but there are ones that I would never use and others I would not hesitate to use even if you told me it had not been serviced in 10 years.
A 20 year old MR-12 III or a USD Conshelf will never fail, just breath like crap. I have hooked up old Royal Aquamaster DH reg to tanks that hasn't seen a shop in 30 years that worked fine. But open a box with a Poseidon Odin (which I have owned a few of) and I would walk away. My buddy has nothing but Scuba Pro's that are always going in for service for one reason or another, my Apek's never need service. But the Scuba Pro's never "failed".
Although, complete disclosure, I have been using Apeks regs since about 99, I have 5 or 6, in all that time I had one that the diaphragm in the first stage failed, but I believe it was my fault.