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With the old supply line removed, take a moment to inspect the threaded connection points. Use a clean, dry rag to wipe the male threads on both the shutoff valve and the faucet tailpiece. Look closely for any signs of damage such as cross-threading, deep scratches, or significant corrosion. Also, make sure there is no old plumber's tape, putty, or pieces of a broken rubber gasket remaining on the threads. A clean and smooth surface is essential for the new supply line's gasket to create a watertight seal. If you see heavy mineral buildup, you can use a small wire brush to gently clean the threads, being careful not to damage them.

You're viewing a step from: How to Fix a Leak at a Faucet Supply Line Connection

Beginner

30 minutes

2/4 Inventory

This guide provides a comprehensive, step-by-step process for fixing a common leak at the connection point of a faucet supply line. The process involves shutting off the water, removing the old supply line, installing a new one, and testing the connections to ensure a durable, leak-free repair.

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Frequently Asked Questions

How long does a beginner typically need to fix a faucet supply line leak, and what's the most common hold-up?

For most beginners, this project takes about 30-60 minutes. The biggest time-consumer is often preparing the work area, ensuring the water is fully off, and carefully tightening the new connections to avoid overtightening or cross-threading.

The project mentions a 'Braided Polymer Faucet Supply Line.' Are there other types, and how do I ensure I get the right replacement?

Yes, supply lines come in various materials like braided stainless steel or PEX, which are also durable options. The most critical step is to match the length and the connector sizes (e.g., 3/8 in. compression x 1/2 in. FIP) of your new line to your existing one and the connections on your faucet and shut-off valve.

I've replaced the supply line, but it's still leaking slightly after installation. What's the first thing I should check?

First, ensure both nuts are snug but not overtightened; over-tightening can damage internal washers or threads. Confirm the supply line is seated straight without cross-threading, and visually check that the small rubber washer inside the faucet connection is present and intact, as this creates the primary seal.

Is it ever okay to just tighten the old leaky supply line connection instead of replacing the entire line?

You can attempt a slight turn with your wrench to see if it stops the leak, but if it's an older line or already tight, this often isn't a permanent fix and could worsen the leak. Replacing the inexpensive supply line ensures a fresh, reliable seal, especially if the internal washers are worn or compressed.