building trap

building trap, main trap

building trap
A running trap on the outlet side of a building drain (on the sewer side of all drain connections); prevents the passage of odors between the common sewer and the plumbing of the building.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
"We were starting society from scratch - so we had to look at vegetation, start building traps and 'shing," says Daniel.
Creedon's assistance building traps was greatly appreciated.
Now i'ts a case of building traps like gas chambers before they damage anything vital or find evidence to incriminate you.

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