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vacuum braker

noun
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Definition of vacuum braker

: a device admitting (as into a water supply line) air or other gas to vitiate a vacuum (as for preventing back siphonage)

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“Vacuum braker.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vacuum%20braker. Accessed 23 Jun. 2021.

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