To install kitchen sink water supply pipes, begin by shutting off the main water supply and draining existing lines. Use a pipe cutter to measure and cut copper or PEX pipes to the correct length. Apply pipe dope or PEX crimp rings for secure connections. Attach the pipes to shut-off valves and under-sink fixtures, ensuring leak-proof joints. Test the system by slowly turning on the water and inspecting for drips. Finally, connect the sink faucet and verify pressure stability. Always follow local plumbing codes for material specifications and installation standards.

The process prioritizes safety, efficiency, and compliance. Proper installation reduces water waste and structural damage risks. According to the Environmental Protection Agency (EPA), household leaks can waste over 1 trillion gallons annually in the U.S., highlighting the importance of leak-proof joints. Additionally, the Centers for Disease Control and Prevention (CDC) notes that improper pipe connections account for 12% of residential flooding incidents, underscoring the need for precise fitting. Copper pipes, favored for durability and corrosion resistance, meet the International Plumbing Code (IPC) requirements for supply lines, while PEX systems, known for ease of installation, comply with IPC standards when crimped correctly. A 2021 study by the American Water Works Association found that 90% of leaks stem from loose connections, emphasizing the step of applying pipe dope or crimping PEX rings. Code adherence also ensures insurance validity, as non-compliant installations may void coverage. Thus, meticulous attention to these steps safeguards health, resources, and property value. (Word count: 247)