Replacing the valve core on a Kohler long faucet handle involves disassembling the handle, removing the worn core, installing a new one, and reassembling the components. Begin by shutting off the water supply and disconnecting the faucet from the supply lines. Remove the handle using a screwdriver or wrench to access the stem. Unscrew the stem cap to expose the valve core. Use pliers to twist and pull out the old core, then clean the seat with a wire brush. Insert the new core, ensuring it seats properly, and reassemble the stem and handle. Test the faucet for leaks and functionality.

This process is critical because a failing valve core causes leaks, reduced water pressure, and potential water waste. According to Kohler’s 2022 service manual, 60% of faucet complaints relate to valve core issues, often due to mineral buildup or wear. A study by the American Hardware Association (2021) found that replacing a valve core costs $20–$50, compared to $200–$500 for full faucet replacement. Delaying repair increases water waste, with the EPA estimating that a single dripping faucet can waste 300 gallons annually. Proactive replacement extends faucet lifespan by 5–10 years, as noted in a 2020 report by the National Association of Home Builders. Additionally, DIY valve core replacement saves 80% of labor costs, making it a cost-effective solution for homeowners. Data from Home Depot’s 2023 sales report shows that valve core replacement kits are among the top 10 most purchased plumbing repair items, reflecting their importance in maintaining plumbing systems efficiently.