To replace a faucet valve core, begin by shutting off the water supply and draining the faucet. Use pliers to loosen the faucet base, then remove the supply lines. Unscrew the old valve stem and extract the worn core. Insert a new core, ensuring it seats snugly, and reassemble the components. Tighten the base and restore water flow, checking for leaks.

Replacing the valve core is critical because a damaged or corroded core causes persistent leaks, water waste, and higher utility bills. According to the Environmental Protection Agency (EPA), a single dripping faucet can waste over 3,000 gallons of water annually, contributing to household water loss. Additionally, a faulty core reduces water pressure, forcing the faucet to work harder. Industry studies show that 60% of faucet leaks stem from worn valve components, making timely replacement essential for efficiency. The cost of a new core typically ranges from $5 to $20, far cheaper than长期 water waste or faucet replacement. Regular maintenance extends faucet lifespan and aligns with sustainability goals by minimizing resource consumption.