You know what it looks like… but what is it called?
TAKE THE QUIZ“dry pipe”
The following 2 entries include the term dry pipe.
dry-pipe system
noun: a sprinkler system in which water is admitted to the system upon the release of air pressure that the pipes normally contain and which is used where there is danger of freezing
dry-pipe valve
noun: a valve admitting water to a dry-pipe sprinkler system upon the release of air pressure in the system
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Merriam-Webster unabridged
