Safety valve
A safety valve, also known as a pop-safety valve or pop-off valve is a specialty valve installed on a chamber to prevent over-pressurization. They are available in a wide range of pressure ratings, from pressures lower than you'd want to use in a spudgun to pressures higher than a PVC chamber will hold.
These are most commonly installed when you are using a pressure regulator, so that if it malfunctions it won't fill your chamber to the point where it fails, although no such event has been recorded.
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