stopcock

US /ˈstɑːp.kɑːk/
UK /ˈstɑːp.kɑːk/
"stopcock" picture
1.

止水栓, コック

a valve that regulates the flow of fluid through a pipe, especially one controlling the flow of water to a building or appliance.

:
The plumber turned off the main stopcock before starting the repair.
配管工は修理を始める前に主止水栓を閉めた。
Make sure to locate the stopcock in your home in case of a leak.
漏水の場合に備えて、自宅の止水栓の場所を確認してください。