This device controls the flow of water to a clothes washer. Typically located near the appliance, it consists of a small valve connected to the water supply lines. A simple turn of the handle stops or allows water flow, isolating the machine from the main water system. This localized control is crucial for repairs, maintenance, or preventing leaks.
Isolating the appliance offers significant advantages. It allows for routine maintenance, such as replacing hoses, without disrupting water service to the entire house. More critically, these valves prevent potentially catastrophic water damage by quickly halting leaks from burst hoses or malfunctioning appliances. Historically, accessing the main water supply was often necessary for such tasks, causing significant inconvenience. The advent of readily accessible, appliance-specific controls provides a simple yet effective safety measure.