To replace a faucet valve core, begin by shutting off the water supply and draining the faucet. Remove the handle and escutcheon plate using a flathead screwdriver. Use pliers to loosen and remove the retaining nut or seat ring. Extract the damaged valve core and clean the seat with a seat wrench or rag. Apply plumbers' grease to the new core and O-rings, then insert it into the seat, ensuring it seats properly. Tighten the retaining nut evenly and reassemble the faucet. Test for leaks by turning on the water and checking under the sink.

This process is critical because a faulty valve core accounts for 30% of faucet leaks in U.S. households, according to the Environmental Protection Agency (EPA). Leaks waste an average of 10,000 gallons of water annually per household, contributing to higher utility bills and environmental strain. Replacing the valve core—a $5-$15 part—saves homeowners $100-$300 annually in water costs compared to professional repairs, per HomeAdvisor data. Additionally, a well-maintained valve core extends faucet lifespan by 5-10 years, reducing long-term replacement expenses. The EPA estimates that fixing leaks can reduce household water waste by 10%, conserving critical resources. Neglecting this repair often leads to mineral buildup,进一步损坏密封件 and accelerates wear, increasing the likelihood of costly system failures. Thus, valve core replacement is both cost-effective and environmentally responsible, aligning with sustainable home maintenance practices.