Stop valve

válvula de cierre

(n.) = llave de paso, válvula de paso, válvula de cierre
Ex: If you install a stop valve, it will save you the trouble of shutting off the water in the entire home for a single sink or toilet repair.

SPA: Llave de paso
The valve that allows water supply to be cut off to one fixture without affecting the water supply to the entire house or building. Common for use with wash basins, tubs, sinks, and toilets.