A check stop is a type of shut-off valve used in tub and shower faucet installations. It allows for the isolation of water flow to the fixture without affecting the entire plumbing system. Check stops are typically installed on the hot and cold water supply lines leading to a mixing valve, enabling maintenance, repair, or replacement of the valve without shutting off water to other parts of the building. The check stop has a built-in check valve mechanism that prevents backflow, ensuring that water flows in only one direction. This feature enhances the safety and functionality of the plumbing system, preventing cross-contamination between hot and cold water lines.
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