sewer 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 ?
Install check valves in building sewer traps to prevent flood waters from backing up in sewer drains.
Have check valves installed in sewer traps to prevent flood water from backing up through the drains into your home.
Have check valves installed in building sewer traps to prevent flood waters from backing up in sewer drains.
Request information on preparing for flooding conditions, and have check valves installed in building sewer traps to prevent flood waters from backing up in sewer drains; -- Plan and practice an evacuation route.
Request information on preparing for flash flooding conditions, and have check valves installed in building sewer traps to prevent flood waters from backing up in sewer drains; * Plan and practice an evacuation route.
Learn flood-warning signs and your community alert signals; request information on preparing for flooding and specifically flash floods and have check valves installed in building sewer traps to prevent flood waters from backing up in sewer drains.
Learn flood-warning signs and your community alert signals, request information on how to prepare for floods and flash floods, and have check valves installed in building sewer traps to prevent flood waters from backing up in sewer drains.