In English:; Llave de paso. (de agua)

How to call a valve in a pipe which controls the flow of liquid through it.
Cambridge Dictionary Online

Stopcock

A stopcock is cock for stopping or regulating flow (as through a pipe) .
Merriam Webster Online.

In News:

"“All we could do was to try and turn the water off to the entire block and the property. We were unable to do this because the stopcock had broken."
Southend Standard.

"At about 2.30am, the property in Hambro Avenue went under water after the stopcock had broken."
Echo.

In French       En francais       En francés

Robinet d’arrêt.
Collins Dictionary