Bubbletrubble
Contributor
South Jersey (air/water) must be hard on regs. That hasn't been my experience at all here in SoCal, but then again I don't own nearly as many regs as you do.I think even with good maintenance and storage, 2 years is the outside.
I find that my regs work just fine at around the 2.5-3 year mark post-overhaul.
Outside the normal parts replaced during an overhaul, I haven't had to change the reg mouthpieces, 2nd stage diaphragms, or exhaust valves in many years (8?). Can't think of anything else that would be prone to dry rot, with the exception of hoses. The hoses I own haven't shown any wear for a number of years. A couple years ago I switched over to a long hose primary setup and had to purchase new hoses of different lengths.