A petcock is a small valve or faucet used to drain liquids, release pressure, or bleed air from a system. In plumbing, petcocks are often found on water heaters, boilers, or radiators to allow for draining or pressure relief during maintenance or repair. They can also be used to remove air from water lines, improving flow and preventing airlocks. Petcocks are typically made of brass or stainless steel and are designed for easy operation, often featuring a lever or screw handle. Regular inspection and maintenance of petcocks ensure proper function, leak prevention, and safe operation of plumbing systems.
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