This is a 100PSI aftermarket relief valve equivalent to the Victor #0600-0007 relief valve for Victor regulators and flowmeters.
This relief valve is for C series regulators that have a delivery pressure of 80 PSI.
Generally, if this valve is leaking or popping, there is problems with the seat valve of the regulator or flowmeter. This valve is designed to vent or leak. It keeps the regulator from building pressure during a failure of the seat valve.
Our Part # V-277