Shutoff valve

válvula de control | válvula de cierre | válvula de corte (apertura y cierre)

(n.) = llave de paso, válvula de paso
Ex: If you have a leak inside your house, look under the sinks or toilets for a shut-off valve.

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.