1/4" Brass Anti-Vacuum Valve

Also called siphon, anti-siphon or vacuum breaker valve. This valve allows air to escape the boiler as the water heats up, hissing and then closing off when the boiler water reaches it's operating temperature, sealed by the steam pressure created. Measure your existing valve: the outside of the male threads of a 1/4" BSP fitting measure 1/2". One may also use this version.

Gaskets are not always required; as the valve and boiler expand any small leaks at the junction will likely take care of itself. A good rule of thumb: if your valve and boiler had a gasket, get a new replacement for added assurance.

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