When you need a replacement part for repair or maintenance of a flush valve, trust Zurn for genuine, reliable parts. Constructed of durable, chrome-plated cast brass, this ¾-inch vacuum breaker nut (part no. P6000-AA-CP) fits Zurn ZTR series flush valves. ZTR series piston flush valves feature a chemical and clog-resistant vacuum breaker and internal seals made from our GO BLUE® thermoplastic elastomer. GO BLUE® parts last up to 10x longer than the competition, reducing maintenance costs over the life of the valve.