returnpipe
nounUK /rɪˈtɜːn paɪp/
US /rɪˈtɜːrn paɪp/
A return pipe is a tube that carries water or air back to where it started.
The plumber fixed the return pipe so the hot water could flow back to the boiler.
RELATED WORDS
OTHER MEANINGS
2. In heating and cooling systems, a pipe that carries used fluid back to the heater or chiller.
The return pipe from the radiator was cold, which showed the system was not working.
3. In engineering, a conduit that sends a substance back into a main system or tank.
Engineers installed a return pipe to recycle the coolant.
4. A pipe used to send something back to its source, such as in a fountain or pool.
The fountain's return pipe pushes the water back up to the top.