Small Bathroom P Trap

By | October 20, 2023

Essential Considerations for Choosing the Perfect Small Bathroom P Trap

A P trap is an essential plumbing component that plays a crucial role in preventing sewer gases from entering your bathroom. In small bathrooms where space is limited, choosing the right P trap is essential to ensure proper drainage and a pleasant environment.

Small bathrooms typically have a limited amount of space beneath the sink, which poses a challenge when selecting a P trap. However, there are several types of P traps designed specifically for small spaces. Understanding the different types and their features will help you make an informed decision.

Types of Small Bathroom P Traps

Here are some of the most common types of P traps for small bathrooms:

1. Bottle Trap:

A bottle trap is a traditional type of P trap that features a bulbous shape. It is suitable for shallow spaces and provides a good seal against sewer gases. However, bottle traps can be more challenging to clean compared to other types.

2. Center Outlet P Trap:

A center outlet P trap is a compact and space-saving option. It features an outlet located in the center of the trap, making it ideal for tight spaces. Center outlet P traps come in various designs.

3. Side Outlet P Trap:

A side outlet P trap has an outlet on the side of the trap, making it suitable for installations where the drainpipe is offset. Side outlet P traps are particularly useful when space is limited behind the sink.

4. Inline P Trap:

An inline P trap is a flat and compact trap that can be easily concealed beneath the sink. Inline P traps provide a clean and modern look and are often used in small bathrooms where aesthetics are a priority.

Factors to Consider When Choosing a Small Bathroom P Trap

When selecting a small bathroom P trap, consider the following factors:

1. Available Space:

Measure the space beneath your sink to determine the maximum size of P trap that will fit. Consider the height, width, and depth of the available space.

2. Drainpipe Location:

Determine the location of the drainpipe to select a P trap with an outlet that aligns correctly. Some traps are designed for offset drainpipes, while others require a direct connection.

3. Material:

P traps are typically made from PVC, ABS, or brass. PVC and ABS are lightweight, affordable, and easy to install. Brass is a more durable and corrosion-resistant option.

4. Accessibility:

Consider the accessibility of the P trap for future maintenance and cleaning. Ensure that you can easily reach the trap in case of a clog or blockage.

Installation Tips

To ensure proper installation of your small bathroom P trap, follow these tips:

1. Use a Plumber's Putty:

Apply a ring of plumber's putty around the base of the P trap before connecting it to the drainpipe. This will create a watertight seal.

2. Tighten the Connections:

Use a wrench to hand-tighten the connections between the P trap, drainpipe, and sink. Avoid over-tightening, as this can damage the components.

3. Check for Leaks:

Once the P trap is installed, run water through the sink and check for any leaks. If you notice any leaks, tighten the connections further or apply more plumber's putty.

4. Maintain the Trap:

Regularly clean the P trap to prevent clogs and blockages. Remove any debris or hair that may accumulate in the trap using a brush or drain cleaner.


Choosing the right P trap for your small bathroom is essential for ensuring proper drainage and a pleasant environment. By understanding the different types of P traps, their features, and the factors to consider, you can make an informed decision. Remember to follow the installation tips and maintain the trap regularly to ensure its optimal performance.

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