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Mechanism of the Freeze Plug

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New Freeze Proof Hose Bib! #plumbing #plumber #diy

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What happens here

The Arrowhead Brass Ice Breaker series hydrants feature a specialized vent cap that contains a 'freeze plug.' If a hose is inadvertently left connected and water inside the hose freezes and expands, the freeze plug is designed to automatically eject from the cap. This controlled ejection releases the pressure from the expanding ice, thereby protecting the main pipe or 'barrel' of the hydrant from bursting.

Goal: Learn how the freeze plug protects the hydrant from freezing.

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So, in a standard hydrant, what will happen if you keep the hose on, water will back up, water expands, and will actually burst the pipe. What we've come up with through the vent cap, if you leave the hose on, inside here there's a freeze plug. So, as the water freezes through the hose, it will actually pop the plug, keeping the barrel safe. And all you need to do in the spring once once the thaw comes, is just replace this cap and you are good to go.

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