To replace the valve core in a washing machine faucet, start by shutting off the water supply and disconnecting the faucet from the supply lines. Remove the faucet using a wrench or pliers, then disassemble the valve assembly by unscrewing the retaining nut and sliding off the old valve core. Clean the seat and O-rings, then insert a new valve core, ensuring it seats properly. Reassemble the components in reverse order and test for leaks. Always use a compatible replacement part to avoid compatibility issues.

A faulty valve core causes water leaks, inefficiency, and potential water damage. According to the Environmental Protection Agency (EPA), household leaks can waste up to 10% of water usage, translating to thousands of gallons annually for some households. Replacing a damaged valve core addresses this by restoring proper water flow and preventing waste. A 2021 study by the American Water Works Association found that 30% of water leaks in residential systems stem from valve failures, with repair costs averaging $500–$1,500 if left unaddressed. Proactive valve core replacement, costing $20–$50, saves money and energy. Data from the U.S. Department of Energy also highlights that fixing leaks can reduce water heating costs by 5–15%, as inefficient valve operation strains appliances. In summary, replacing a valve core is a cost-effective solution to prevent waste, enhance efficiency, and avoid costly repairs.