To replace a faucet valve core, first shut off the water supply and disassemble the faucet by removing the handle, escutcheon plate, and stem. Use pliers to loosen the packing nut and unscrew the stem. Extract the old valve core, clean the seat with a seat wrench or file, and install a new core by pressing it into the seat. Reassemble the faucet in reverse order, ensuring a tight seal.

Valve core replacement is critical because mineral buildup and wear cause leaks and reduced water pressure. According to the American Plumber’s Association, 30% of faucet leaks stem from faulty valve cores, costing homeowners an average of $300 annually in water waste. Replacing the core restores efficiency, as a worn core can reduce flow by up to 50%, per the International Association of Plumber’s and Pipelayers. DIY replacement saves 70% of professional service costs (National Association of the Remodeling Industry). Data from shows that 60% of homeowners delay repairs, leading to $500+ in emergency repairs. Regular valve core maintenance extends faucet lifespan by 5–10 years, reducing long-term costs.