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This Automatic Anti-Vacuum Valve protects against vacuum formation in hot water installations. It allows air to enter the system automatically when a vacuum condition is detected, which helps to maintain consistent pressure and prevent issues like pipe collapse or back-siphonage. Its solid brass structure ensures durability. The valve's top design allows for easy access to internals for quick servicing. Installation is simple and efficient. This valve helps maintain system stability and prevents potential damage caused by negative pressure.. RWC ADMT503001 Automatic Anti-Vacuum Valve - 1/2 inch Reliance Water Controls (RWC)