A fitting installed in the vapor piping at the base of a dispenser that is designed to “shear” or break off if the dispenser cabinet is dislodged from its base. The vapor shear valve may incorporate a test port that can be used to introduce nitrogen or a product into the vapor piping.
The vapor shear valve may also include poppets that cap off the vapor piping to the tank and the vapor piping in the dispenser when the shear section separates.
See also PEI/RP300.
