Water Service Vacuum Relief Valve, Lead-free, 1/2 In.

1/2", lead free, water service vacuum relief valve, allows air to enter a closed system to automatically relieve vacuum conditions which could siphon the water from the system & burn out a water heater or collapse a tank, csa, ansi & Massachusetts state code listings.

• Automatically relieves vacuum conditions
• Protects against water heater tank collapse
• Protects against water heater tank burn out