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Under-Sink Plumbing Bi-Annual

How to Inspect Under-Sink Plumbing

A quick visual and physical inspection under your sinks can save thousands in water damage repairs. This check only takes 2 minutes per sink.

Time Required Varies
Difficulty Varies
DIY Skill Varies

Why It Matters

Inspect supply lines and shutoff valves. Check the faucet connections for moisture.

Before You Start

  • Empty the cabinet.
  • Keep a flashlight and paper towels available.
  • Know where the local water shutoff valves are.

Step-by-Step Guide

1

Inspect supply lines and shutoff valves.

2

Check the faucet connections for moisture.

3

Inspect the drain trap and drain connections.

4

Place a dry paper towel beneath connections to detect small leaks.

5

Check the cabinet floor for swelling or water damage.

6

Run the faucet and inspect the plumbing while water is flowing.

7

Repair leaks promptly before cabinet or flooring damage develops.

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Common Mistake to Avoid

Rushing through the process or using the wrong tools. Always use appropriate gear and follow recommended guidelines.

Frequently Asked Questions

What exactly should I check?

Wipe a dry paper towel over the supply valves (where water enters from the wall), the flexible supply lines, the P-trap (the curved drain pipe), and the connections to the dishwasher and garbage disposal if under the kitchen sink.

What is a P-trap?

The P-trap is the U-shaped pipe under the drain. It holds a small amount of water to block sewer gases from rising into your home. It's a common site for clogs and leaks at the connecting slip nuts.

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