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Traps are supposed to prevent sewer gas from entering your home by creating a water seal in your drainage pipes. Two common types of traps are the P-trap and the S-trap. While they may look similar, they serve slightly different purposes and are used in different scenarios. At Rooter Hero Plumbing & Air, we provide reliable plumbing service options for our local clients, including repiping and pipe replacement. We believe that knowing the difference between these two types of traps can help you make informed decisions about your plumbing needs.
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A P-trap looks like the letter “P” when viewed from the side. It has a curved section of pipe that’s connected to a vertical section, creating a “U” shape with an additional straight segment extending horizontally. This design is highly effective in trapping water and preventing sewer gases from escaping. On the other hand, an S-trap looks like the letter “S” and features two curves that form a continuous "S" shape. It has a vertical section that dips down and then rises back up before connecting to another vertical segment. While S-traps were commonly used in older plumbing systems, they are now largely outdated and often replaced due to potential issues with their design.
P-traps are used extensively in modern plumbing systems due to their effective design. When water flows through a P-trap, it gets trapped in the curved section of the pipe. This trapped water acts as a barrier, preventing sewer gases from passing back into the home. P-traps include a clean-out plug, which allows for easy removal of any debris that may accumulate, ensuring the trap continues to function properly. One of the key benefits of a P-trap is its ability to maintain a consistent water seal. Because of its shape, water cannot easily siphon out, even when subjected to fluctuations in pressure. This reliability makes P-traps the preferred choice for sinks, showers, and other fixtures where maintaining a strong seal is essential for preventing odors and gas leaks.
S-traps, while similar in function to P-traps, have a few notable differences in their operation. Like P-traps, S-traps create a water seal that prevents sewer gases from coming into the living space. However, their design includes two curves, making them less efficient at maintaining a consistent water barrier. One issue with S-traps is their susceptibility to siphoning. When a large volume of water flows through an S-trap quickly, it can create a vacuum that pulls the water out of the trap, breaking the seal and allowing gases to escape. This siphoning effect is particularly problematic in areas with high water flow or variable pressure conditions. Due to these potential issues, building codes in many areas now prohibit the use of S-traps in new construction. They may still be found in older homes, but it is often recommended to replace them with P-traps or other approved trap designs to ensure proper functionality and safety.
Deciding whether to use a P-trap or an S-trap depends largely on your specific plumbing needs and local building codes. For most modern applications, P-traps are the best choice due to their dependability and ease of maintenance. They are versatile and can be used in various plumbing fixtures, from sinks and bathtubs to washing machines and dishwashers. Speaking with a professional plumber can help you determine the best course of action for your specific situation. We can assess your current plumbing system, recommend the most appropriate trap type, and ensure that your repiping or new installation meets all local regulations and codes.
If you’re considering upgrading your plumbing traps or need assistance with any plumbing-related issues, Rooter Hero Plumbing & Air is here to help. Our services include comprehensive inspections, expert installations, and reliable maintenance, all tailored to meet your unique needs. Contact us today to schedule a pipe replacement or plumbing service with a reliable local plumber.