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I'll get one to open it up and see what makes it tick, I bet there's a commercial version out there that might look different but functions the same.

I can't believe that there is no aftermarket or alternative valve out there, its just a spring-loaded diaphragm, right? What are the specs on the spring, opening pressure, etc? I bet we could get these made by Global-Spec if we provided an example and a minimum order...