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Understanding Running Traps: An In-Depth Shopping Guide

Running traps, also known as building traps, are plumbing devices designed to prevent sewer gases from entering homes. They were commonly installed in older buildings before the 1950s when individual traps for each fixture became standard. Today, running traps are often considered outdated and can pose significant risks if not managed properly. This guide will help you understand what running traps are, their applications, benefits, how to choose them, and practical tips for users.

Comparison of Different Types of Running Traps

Type Description Common Applications Pros Cons
Running Trap A trap in the main sewer line, preventing gas from entering the home. Often found in older homes and public restrooms. Prevents sewer gas; simple design. Difficult to clean; prone to clogs.
P-Trap A U-shaped trap installed under sinks and toilets. Commonly used in modern plumbing. Easy to clean; effective odor barrier. Requires vertical space.
S-Trap An S-shaped trap primarily for floor drains. Used in older bathroom installations. Prevents odors; space-efficient. Can allow odors if not maintained.
Drum Trap A cylindrical trap with easy access for cleaning. Typically found in older homes. Easy access for maintenance; effective. May not fit modern plumbing standards.
Intercepting Trap A deep trap for large buildings’ drainage systems. Used in commercial applications. Handles large volumes; prevents pests. Requires significant space and maintenance.

Everyday Usage of Running Traps

Running traps are primarily used in older plumbing systems, particularly in buildings constructed before the mid-20th century. They serve as a barrier to prevent sewer gases from infiltrating living spaces. While modern plumbing typically uses individual traps for each fixture (like P-traps or S-traps), running traps were designed to service multiple fixtures from a central location.

Common situations where running traps may be found include:

  • Older Residential Homes: Many homes built before 1960 may still contain running traps as part of their plumbing systems.
  • Public Restrooms: Running traps are often used in commercial settings where multiple washbasins or toilets share a common drain line.
  • Basements: In some older basements, running traps can be located as part of the drainage system.

Benefits of Running Traps

  1. Sewer Gas Prevention: Running traps create a seal that prevents harmful sewer gases from escaping into your home, thus protecting indoor air quality.
  2. Simple Design: The straightforward construction of running traps allows for ease of installation in certain plumbing configurations.
  3. Historical Significance: Understanding running traps is essential for plumbing professionals working on older buildings, where these systems may still be in use.

How to Choose a Running Trap

When considering a running trap, it’s essential to evaluate the following factors:

  1. Building Age: Determine if your home or building is old enough to have a running trap. Homes built before the 1950s are the most likely candidates.
  2. Local Plumbing Codes: Check local plumbing regulations, as many areas have outlawed the installation of running traps in new construction due to safety concerns.
  3. Condition of Existing Traps: If a running trap is already installed, assess its condition. Look for signs of corrosion, leaks, or blockages.
  4. Professional Assessment: Always consult a licensed plumber to inspect your plumbing system and provide recommendations based on current building codes and best practices.

User Tips for Running Traps

  • Regular Inspections: If you have a running trap, schedule regular inspections with a plumber to ensure it is functioning correctly and to prevent clogs.
  • Be Aware of Signs of Trouble: Watch for slow drains, gurgling sounds, or unpleasant odors, which may indicate a blockage in the running trap.
  • Consider Replacement: If you have a running trap, consider replacing it with modern plumbing traps that are easier to maintain and comply with current plumbing codes.
  • Educate Yourself on Alternatives: Familiarize yourself with alternatives like P-traps or S-traps, which offer better performance and safety.


Are running traps legal by plumbing code? - How To Look At A House - running trap

Technical Features and Specifications of Running Traps

Feature Specification
Material Typically made of cast iron or PVC
Size Standard sizes vary, but commonly 3 to 4 inches in diameter
Water Seal Depth Designed to maintain a water seal of at least 2-4 inches
Installation Depth Requires sufficient depth; often installed below ground level
Cleaning Access Generally lacks clean-out access, complicating maintenance

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Conclusion

Running traps play a critical role in older plumbing systems, but their outdated design poses several risks, including clogs and sewer gas leaks. Understanding their functionality, benefits, and the importance of regular maintenance is essential for homeowners with older plumbing systems. If you’re uncertain about your plumbing setup, it’s best to consult a licensed professional to assess your traps and ensure compliance with current plumbing codes.

Frequently Asked Questions (FAQs)

What is a running trap?
A running trap is a plumbing device that prevents sewer gases from entering a building. It is typically found in older plumbing systems and is designed to seal the main drain line.

Are running traps still legal?
Most modern plumbing codes prohibit the installation of running traps in new constructions. However, existing traps in older buildings may still be present and need to be assessed.

How do I know if I have a running trap?
If your home was built before the 1950s, it’s possible you have a running trap. A professional plumber can inspect your plumbing system to confirm.

What are the risks of having a running trap?
Running traps can lead to sewer gas leaks, clogs, and potential plumbing backups, making them a safety concern in modern plumbing systems.

Can I replace a running trap with a P-trap?
Yes, it is often recommended to replace a running trap with a P-trap or another modern alternative for better performance and compliance with plumbing codes.

What maintenance do running traps require?
Regular inspections for blockages and leaks are essential. However, running traps are difficult to clean due to their design, making replacement advisable.

What should I do if my running trap is clogged?
Contact a licensed plumber to assess the situation. They can provide the best course of action, which may include cleaning or replacing the trap.

Are there alternatives to running traps?
Yes, modern plumbing systems typically use P-traps or S-traps, which are more efficient and easier to maintain.


No vertical room for a Standard P-Trap, is Running Trap permitted? - running trap

How much does it cost to replace a running trap?
The cost can vary widely based on location, accessibility, and the complexity of the plumbing system. It’s best to get a quote from a licensed plumber.

How can I prevent issues with my running trap?
Schedule regular inspections, be mindful of what goes down the drain, and consider replacing the trap if it shows signs of damage or blockage.