The T&S Brass B-0456-04-963VB Vacuum Breaker Assembly is designed for reliable performance in plumbing applications. It features a 4-1/4" center mounting for easy installation and is equipped with 1/2" NPT male threads for secure connections. The adjustable slip flanges (B-0460) allow for versatile installation options. Constructed with low lead materials, this assembly meets NSF standards, ensuring safety and compliance in water systems. Ideal for preventing backflow, it enhances the efficiency and safety of your plumbing setup.