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S Trap vs P Trap | Know The Difference For Choosing the Best Plumbing Solution [2024]


Let’s understand the S Trap vs P Trap with valuable data. When it comes to plumbing, every homeowner wants a system that is efficient and reliable. The S-trap and the P-trap are two popular plumbing traps found in most household situations. 

These vital components prevent undesirable odors and gases from returning to our living areas. Choosing the right trap for your plumbing needs, on the other hand, is critical. In this post, we will look at the differences between the S-trap and the P-trap, as well as their functions and which one would be better for your home.

Also, if you need a professional plumber in Sherman, TX, then don’t hesitate to contact us at Plumbers Sherman TX. We are available the whole day. Get in touch with us, and we will solve your problem soon.

S Trap vs P Trap: Understanding the Purpose of Traps

S Trap VS P Trap

Before moving on to the differences between S-traps and P-traps, it’s important to understand their primary function. The traps are intended to create a water seal in the plumbing system, preventing odorous sewage gases from entering our homes. Because these gases can be harmful to our health and produce unpleasant odors, traps are an essential component of any plumbing system.

Read More: How to Reinforce Floor Joists for Plumbing

The S Trap

The S-trap gets its name from its shape, which resembles the letter “S.” It is a common type of trap found in older plumbing systems. The S-trap is placed under sinks, bathtubs, and other plumbing fixtures, and relies on a water seal to prevent waste gases from entering the building. When the water drains from the fitting, it forms a temporary seal that prevents gases from moving back up the pipe.

The P Trap

The P-trap, on the other hand, is shaped like the letter “P” when viewed from the side. It is the most modern and widely used siphon in domestic plumbing today. The P-trap has a curved portion that traps water long after the flow of water from the fixture has stopped. This continuous water seal functions as a barrier against sewer gases, making it a more reliable solution than the S-trap.

Advantages of the S Trap

– Due to its basic design, it is easy to install in specific scenarios.

– Suitable for older plumbing systems that were initially installed with S-traps.

Disadvantages of the S Trap

– Prone to lose its water seal, allowing the entry of sewage gases and unpleasant aromas.

– Due to its restrictions, it does not meet modern construction requirements in many places.

– Siphonage may occur, resulting in delayed drainage or gurgling sounds.

Advantages of the P Trap

– Maintains a more reliable water seal, providing greater protection against residual gases.

– Less prone to siphonage, resulting in effective drainage and fewer clogs.

– Meets modern building regulations, giving you a safer and more acceptable option.

Disadvantages of the P Trap

– Due to its complicated design, it may require additional labor and expertise during installation. 

– In some cases, space under the fixture may be limited, making it difficult to install a P-trap.

Common Usage Scenarios

S Trap: The S-trap is not recommended for new plumbing systems, but is still seen in older homes. When repairing or upgrading plumbing systems, it is critical to replace S-traps with P-traps.

P Trap: The P Trap is the ideal alternative for most household plumbing needs. It is commonly used under sinks, baths, showers, and other fixtures.

Upgrading from an S Trap to a P Trap

Consider upgrading to P-traps if your home still has S-traps. Upgrading your plumbing system will not only make it up to code, but it will also provide better protection against waste gases and improve drainage efficiency.

DIY vs. Professional Installation

While minor trap replacements can be done as a DIY task, it’s critical to understand their limitations. If you are unsure of your plumbing skills, it is best to leave the installation to a licensed professional. Improper installation can cause leaks, clogging, and water damage.


Choosing the correct plumbing trap is critical to keeping your home’s plumbing system healthy and efficient. While the S-trap has been useful in the past, the P-trap is now the preferred and commonly recognized option.

Its improved construction ensures a strong water seal, protecting your property from odors and dangerous sewer gases. Remember to consult with a professional plumber before upgrading or replacing any trap to ensure a smooth and effective installation. A well-maintained plumbing system will not only give you peace of mind but will also make your home safer and more comfortable.

I hope you get the actual information about S Trap vs P Trap correctly and decide on your plumbing system to improve your water supply. Thanks for reading the whole article. I hope you enjoy it. Write your comment below.

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