noun
integrated hydrant system; fire department connection piping
Engineering and firefighting term for a building's internal piping system that allows firefighters to connect hoses and supply water to upper floors.
高層ビルには連結送水管の設置が義務付けられている。
High-rise buildings are required to have an integrated hydrant system installed.
消防隊は連結送水管を使って各階に放水した。
The fire brigade used the fire department connection piping to spray water on each floor.
Compound of 連結 (connection), 送水 (water supply), and 管 (pipe). The term is a modern technical coinage for firefighting infrastructure.