dead leg

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dead end

1. A length of pipe leading from a soil, waste, or vent pipe, building drain, or building sewer, which is terminated by a plug, cap, or other closed fitting; there is no circulation in this length of pipe, and no waste from a plumbing fixture is fed into it.
2. The point of fastening in a running rope system where the other end is fastened to a rope drum.
3. In concrete work, the end opposite that to which a load is applied.
4. A portion of a corridor in which the travel to an exit is in one direction only.