[martin417]

Originally Posted by bachster

If using these, just remember that you still must meet R89:



Does anyone have an example of a useful application for the 3-way exhaust valve?

A quick exhaust valve is not covered by that rule, because it is not a pressure vent plug. A quick exhaust valve is a three port valve that passe air from one port to another port in one direction, but to an exhaust port in the other direction.