Attempting to replace or service a water supply valve without first turning off the main household water supply or the local shut-off valve is extremely dangerous and strongly discouraged. Without shutting off the water source, removing the old valve or disconnecting supply lines will cause high-pressure water to spray uncontrollably, resulting in immediate indoor flooding, potential slip hazards, and extensive water damage to walls, flooring, and cabinetry. Always shut off the water supply and relieve internal pipe pressure completely before starting any plumbing repair or valve replacement work.
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