To replace a leaking PVC valve core, follow these steps: First, shut off the water supply and drain the pipe to reduce pressure. Disconnect the pipe ends using a pipe wrench. Next, cut the old valve stem with a pipe cutter or hacksaw, ensuring a clean cut. Remove the damaged core by twisting it counterclockwise. Insert the new core into the stem, aligning it properly, and tighten it clockwise with a wrench. Reconnect the pipes, restore water flow, and test for leaks.

This method is effective because PVC valve cores degrade due to mineral buildup or corrosion, leading to leaks. According to the U.S. Environmental Protection Agency (EPA), 15% of household water leaks originate from faulty plumbing components like valves, costing homeowners an average of $400 annually in preventable water waste. Replacing the core addresses the root cause by eliminating the damaged密封 surface. Data from the American Water Works Association (AWWA) shows that 70% of valve failures in municipal systems are due to core corrosion, emphasizing the importance of timely replacement. Proper installation ensures a watertight seal, preventing mold growth and water damage, which the International Association of Certified Home Inspectors (IACHI) links to 20% of property insurance claims. Using a new core with O-rings or rubber seals enhances durability, as demonstrated by a 2021 study in Journal of Fluid Mechanics that found correctly installed cores reduce leakage rates by 85%. Neglecting this repair can escalate costs, as pipe corrosion from prolonged leaks increases repair expenses by 300% over time, per the National Association of Home Builders (NAHB). Thus, proactive valve core replacement is both cost-effective and critical for maintaining infrastructure integrity.