You know what it looks like… but what is it called?
TAKE THE QUIZ“pipe system”
The following 2 entries include the term pipe system.
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
wet-pipe system
noun: a sprinkler system in which the pipes contain water under pressure even when not in use
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Merriam-Webster unabridged
