What Is the Purpose of a Drain Clean-Out?

by | Sep 17, 2025 | Blog

Home plumbing systems are designed to keep water flowing smoothly out of your sinks, tubs, and toilets. But over time, pipes can develop blockages from grease, soap scum, hair, and other debris. If you’ve ever wondered, “Do I need a drain clean-out?” the simple answer is yes. A drain-cleanout is an essential part of your plumbing system. Ignoring it can lead to serious clogs, sewage backups, foul odors, and costly damage to pipes or even your home’s foundation.

In this article, we’ll break down the purpose of a drain clean-out, why it matters, and how professionals use tools like borescopes to inspect and maintain them.

What’s a Clean-Out Drain?

A clean-out drain is a special access point built into your plumbing system that allows plumbers to reach and clear out blockages in the main sewer line or branch pipes. Typically, it looks like a capped pipe sticking out of the ground, floor, or wall near your home’s foundation.

The clean-out is strategically placed so that if waste, grease, or tree roots clog your pipes, a professional can insert augers, hydro-jetting equipment, or even cameras directly into the system. This makes it much easier and less invasive to diagnose and fix plumbing problems.

Why Is a Drain Clean-Out Important?

A clean-out might not look like much, but it plays a vital role in keeping your plumbing system healthy:

  • Prevents Major Blockages: By giving plumbers direct access, clean-outs help stop small clogs from turning into costly sewer backups.
  • Saves Time and Money: Instead of digging or tearing into walls, professionals can quickly locate and clear obstructions.
  • Allows Detailed Inspections: With tools like borescopes, technicians can see inside pipes and identify cracks, corrosion, or buildup before they cause bigger problems.
  • Protect Your Property: Sewer backups can damage flooring, drywall, and even your foundation. A clean-out helps minimize this risk. 

Where Can You Find a Drain Clean-Out?

Most homes have at least one clean-out located along the main sewer line. Common spots include:

  • Just outside the home near the foundation
  • In basements or crawlspaces
  • Along the exterior sewer line leading to the street
  • Near bathrooms or laundry rooms in older homes

If you’re not sure where your clean-out is, a licensed plumber can help locate it. In some cases, homeowners discover they don’t have an accessible clean-out, which can make plumbing maintenance more difficult and costly.

How Is a Drain Clean-Out Used?

When a clog occurs, a plumber will:

  1. Remove the cap to access the clean-out opening.
  2. Inspect the line using specialized tools. In many cases, a borescope inspection is performed, allowing a high-resolution camera to reveal what’s inside.
  3. Clear the blockage with augers, snakes, or hydro-jetting.
  4. Verify the results by running water or conducting a second camera inspection.

By using the clean-out instead of removing fixtures like toilets or cutting into pipes, plumbers can solve problems more efficiently.

How Borescopes Enhance Clean-Out Inspections

At USA Borescopes, we know that access is only half the battle. Once a plumber opens the clean-out, they need a reliable way to see what’s happening inside the line. That’s where borescopes, flexible cameras designed for pipe inspection, make all the difference.

With a borescope, technicians can:

  • Pinpoint the exact location of a clog
  • Identify the type of blockage (grease, tree roots, or foreign objects)
  • Spot early signs of damage like cracks or corrosion
  • Document inspection results for homeowners or city compliance

Using a clean-out in combination with a borescope ensures accurate, efficient maintenance and prevents unnecessary guesswork.

Signs You May Need to Use a Clean-Out

Not every plumbing issue requires a clean-out, but watch for these warning signs that indicate a potential mainline blockage:

  • Multiple drains backing up at once
  • Slow drainage throughout the house
  • Gurgling noises from sinks or toilets
  • Foul odors near drains or in the yard
  • Sewage backup in tubs, showers, or basements

If you notice any of these symptoms, it’s best to call a professional right away before the problem escalates.

Keeping Your Clean-Out Accessible

To ensure your clean-out is useful when you need it:

  • Keep it uncovered and free from landscaping, soil, or clutter.
  • Avoid storing heavy items on top of indoor clean-outs.
  • Have your system inspected every few years, especially in older homes or properties with large trees nearby.

Why Clean-Outs Matter

If you’ve been asking, “What’s a clean-out drain?”, it’s essentially your plumbing system’s emergency access point. It makes inspections, cleanings, and repairs faster, easier, and less disruptive. Combined with advanced borescope technology, clean-outs give professionals the ability to detect and solve problems before they turn into costly emergencies.

Video and Borescope Systems at USA Borescopes

At USA Borescopes, we supply state-of-the-art borescope systems that make drain clean-out inspections more accurate and efficient. Whether you’re a plumber, inspector, or maintenance professional, our tools are designed to save time and deliver clear results.

Contact our team today to learn more about the right borescope solutions for drain and sewer inspections.