The T&S Brass B-0977 Vacuum Breaker Assembly is designed to prevent backflow and protect your water supply. This assembly features a dual check valve for enhanced safety and reliability. It includes necessary adapters for easy installation and is constructed with low lead materials to meet health standards. The 3/4" NPT connection ensures compatibility with a variety of plumbing systems. Certified by NSF, this vacuum breaker assembly is an essential component for maintaining safe and efficient water systems.