running trap

running trap

running trap
A depressed U-shaped section of pipe in a drain; allows the free passage of fluid, but always remains full, whatever the state of the pipe, so that it forms a seal against the passage of gases.
References in periodicals archive ?
Since then, the work of two dedicated burglary squads in the east and the west of the city, as well as initiatives such as tagging students' property with invisible "smart water" and running trap houses, have helped to bring the rate of burglaries down.
As teenagers in the mid 1960s, John Burgeson and his brother, Brian, spent much of their free time running trap lines.
Loose running traps are legal provided they are checked regularly.