Choosing the Best Trap for Your Bathroom Basin: P-Trap vs. S-Trap

What is a Trap?

A trap is a curved section of pipe designed to retain a small amount of water after each use. This water forms a seal, preventing sewer gases from entering your bathroom. Whether you choose a P-trap or an S-trap, both serve the same essential function—but their design and application vary significantly.

P-Trap vs. S-Trap: Understanding the Differences​

P-Trap

A P-trap is shaped like the letter 'P' when viewed from the side. It consists of a horizontal pipe that connects to the waste pipe in the wall. P-traps are the standard choice for most modern bathrooms because they offer superior ventilation and are less prone to siphoning issues.

Key Benefits of P-Traps: ​

• Ideal for wall-mounted waste outlets – The horizontal extension allows easy connection to wall plumbing.

• Better ventilation – Works seamlessly with vent pipes to prevent water seal loss.

• Reduced risk of clogging – The shape minimises debris buildup, promoting smooth drainage.

• Meets modern plumbing codes – Most contemporary building regulations require P-traps for their efficiency and reliability.

S-Trap ​

An S-trap has a more complex design that resembles the letter 'S.' Instead of connecting to a wall-mounted waste pipe, it directs wastewater directly into the floor. This design was more common in older homes and is still used in some specific installations where floor drainage is the only option.

Key Benefits of S-Traps:​

• Ideal for floor-mounted waste outlets – If your plumbing system directs waste downward, an S-trap may be your only option.

• Space-saving design – Suitable for bathrooms where wall drainage is not possible.

• Used in older homes – If your existing plumbing system uses an S-trap, retrofitting a P-trap may require significant modifications.

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Which Trap is Best for Your Bathroom Basin? ​

For most modern bathrooms, a P-trap is the preferred choice due to its compliance with modern plumbing codes, effective ventilation, and reduced risk of siphoning. If you are building or renovating a bathroom with wall drainage, a P-trap is the way to go.

However, if your plumbing system only accommodates floor drainage, an S-trap is the best option.

Choosing the Right Trap with Turner Hastings ​

At Turner Hastings, we understand that even the smallest details contribute to a beautifully functional bathroom. Our collection of premium European-style basins pairs perfectly with high-quality traps designed for durability and efficiency. Whether you're upgrading your bathroom or starting fresh, we offer a range of solutions to meet your plumbing needs.

Still unsure which trap is best for your bathroom basin? Contact our expert team for guidance and ensure your bathroom not only looks stunning but functions flawlessly for years to come.