When it comes to maintaining proper drainage in your plumbing system, a tubular P-trap plays a crucial role. This essential component prevents sewer gases from entering your home while allowing wastewater to flow freely. If you’re experiencing drainage issues or need to replace an old P-trap, installing a new tubular P-trap is a task you can tackle with the right guidance. In this blog post, we will provide you with a step-by-step guide to installing a tubular P-trap, ensuring efficient and odor-free plumbing. Let’s get started!

  1. Gather the Necessary Tools and Materials: Before you begin the installation process, make sure you have all the required tools and materials. These typically include a tubular P-trap kit (with nuts and washers), a hacksaw or pipe cutter, adjustable pliers, a wrench, Teflon tape, and a bucket to catch any water.
  2. Prepare the Work Area: Ensure the area beneath the sink is clear and accessible. Remove any items stored there to provide ample space to work. Lay down a towel or bucket to catch any water that may spill during the installation.
  3. Remove the Existing P-Trap (If Applicable): If you’re replacing an old P-trap, start by removing it. Use adjustable pliers or a wrench to loosen the nuts connecting the trap to the tailpiece and drainpipe. Once the nuts are loose, carefully detach the P-trap and allow any trapped water to drain into the bucket.
  4. Measure and Cut the New Tubular P-Trap: Take precise measurements of the space between the tailpiece and the drainpipe to determine the length of the new tubular P-trap needed. Use a hacksaw or pipe cutter to cut the tubular pieces accordingly. Remember to deburr the cut ends to ensure smooth connections.
  5. Apply Teflon Tape: Wrap Teflon tape around the threaded ends of the tailpiece, drainpipe, and any other connections where necessary. This helps create a watertight seal and prevents leaks.
  6. Assemble the Tubular P-Trap: Begin by connecting one end of the tubular P-trap to the tailpiece. Tighten the nut by hand and then use adjustable pliers or a wrench to ensure a secure connection. Take care not to overtighten, as it can damage the fittings.
  7. Attach the Other End of the P-Trap: Next, connect the other end of the tubular P-trap to the drainpipe. Again, tighten the nut by hand and then use pliers or a wrench to secure the connection. Make sure the trap aligns properly and doesn’t have any kinks or bends that could impede water flow.
  8. Check for Leaks and Proper Alignment: Turn on the water and observe the connections for any signs of leakage. If you notice any leaks, tighten the nuts slightly until the leaks stop. Additionally, check that the P-trap is aligned correctly and doesn’t interfere with any other components under the sink.
  9. Test the Drainage: Once you have ensured a secure and leak-free installation, test the drainage by running water through the sink. Observe the flow and check if any water backs up or drains slowly. If everything appears to be working properly, congratulations! You have successfully installed a tubular P-trap.


Installing a tubular P-trap is a manageable DIY task that can significantly improve the efficiency and functionality of your plumbing system. By following these step-by-step instructions, you can replace an old P-trap or install a new one with confidence.