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.
References in periodicals archive ?
Now i'ts a case of building traps like gas chambers before they damage anything vital or find evidence to incriminate you.
Creedon's assistance building traps was greatly appreciated.
We were starting society from scratch - so we had to look at vegetation, start building traps and 'shing," says Daniel.

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