main 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 ?
The main trap the new government must avoid is a return to a heavily paternalistic style of governance.
But there is a clear global distinction between diplomacy and violence, and this is the main trap for those whom "the moderates" call radical.
The main trap fisheries in Australia are for western rock lobster (Panulirus cygnus) in Western Australia and southern rock lobster (Jasus edwardsii) along the southern coastline.
The main trap targeted has the potential to hold 124 million barrels of oil.