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pressure-vacuum valve

American  
[presh-er-vak-yoo-uhm, -yoom] / ˈprɛʃ ərˈvæk yu əm, -yum /

noun

  1. a valve for relieving a sealed tank of any pressure or vacuum exceeding acceptable limits.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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