The ¾” Bonnet for PVB is an OEM top cover designed for use with ¾” Zurn Pressure Vacuum Breakers (models 420 and 420XL). Made from corrosion-resistant bronze, this bonnet provides durable housing for critical internal components like the air inlet valve, offering structural protection and maintaining system pressure integrity. As part of the PVB’s upper assembly, it ensures continued backflow prevention performance by shielding internal mechanisms from environmental wear and impact.