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pressure-vacuum valve

[ presh-er-vak-yoo-uhm, -yoom ]
/ ˈprɛʃ ərˈvæk yu əm, -yum /
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noun
a valve for relieving a sealed tank of any pressure or vacuum exceeding acceptable limits.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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