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dry sprinkler

From Wiktionary, the free dictionary

English

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Noun

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dry sprinkler (plural dry sprinklers)

  1. A sprinkler (fire protection device) having pressurized air in the distribution pipes until a heat-activated sprinkler head opens and releases the stored air pressure, which opens the water valve.
    A dry sprinkler may be used where there is a risk of water freezing solid within the pipes.
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