Quote:
Originally Posted by Peter Matteson
McMaster and Grainger both cary a variety of pressure relief valves that would work.
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I believe you are correct. McMaster-Carr 8088K14 seems to be the best fit for this application. They seem to be intended for water as the working fluid, but usually air is acceptable as well (a call to McMaster should verify this). Unfortunately, the miniature nylon relief valves are only rated to 10psi and are not truly "adjustable".
It's not clear (to me, at least) from the rule change if a backpressure regulator such as 99045K11 would be legal or not.