How to Plumb a Drain - Sink Drain Pipes

Introduction

This tutorial provides a step-by-step guide to plumbing a sink drain using PVC pipes. Whether you’re working on new construction or replacing existing plumbing, this process is straightforward and can save you money. With the right tools and materials, anyone can successfully install a sink drain.

Step 1: Gather Your Materials

Before starting, ensure you have all the necessary materials. You will need:

• Sanitary tee (drain pipe tee)
• PVC pipe for the stub out
• Marvel connector
• P-trap kit
• Tailpiece extension
• Beveled washers and nuts (included in the P-trap kit)

Step 2: Assemble the Components Without Glue

1. Begin with the sanitary tee in the wall.
2. Fit the PVC pipe into the drain tee to create the stub out.
3. Attach the Marvel connector to the end of the stub out.
4. Prepare the trap arm from the P-trap kit:
   • Slide one nut onto the trap arm with threads facing down.
   • Slide a second nut on with threads facing the opposite direction.
5. Add a washer to the trap arm, ensuring the taper faces down.
6. Connect the trap arm loosely to the Marvel connector without tightening.

Step 3: Connect the P-Trap

1. Attach the P-trap to the trap arm, threading it into place loosely.
2. Prepare the tailpiece for the sink drain:
   • Slide a nut onto the tailpiece, threads facing down.
   • Choose the correct size washer and place it on the tailpiece, ensuring the taper is facing down.
3. Attach the tailpiece extension:
   • Slide a nut onto the tailpiece extension, threads facing toward the end.
   • Add a washer with the taper facing down.
4. Move the P-trap aside and slide the tailpiece extension over the sink tailpiece, securing it loosely.

Step 4: Finalize Connections

1. Connect the bottom of the tailpiece extension to the P-trap.
2. Inspect each piece to ensure a proper fit. If necessary, cut the tailpiece extension or trap arm to size.

Step 5: Secure and Seal the Connections

1. Disassemble the components to apply PVC cement.
   • Apply PVC cement to the inside of the drain tee opening.
   • Apply cement to the end of the stub out pipe.
   • Assemble the parts and give a quarter turn to spread the cement.
2. Repeat this process for the Marvel connector and the stub out.

Step 6: Wrap Threads and Tighten

1. Wrap the threaded connections with Teflon tape for a solid seal. A few wraps should suffice.
2. Hand-tighten each nut until snug.
3. Use channel lock pliers to tighten each union, being careful not to over-tighten to avoid damaging the threads.

Step 7: Test for Leaks

1. If water lines are connected, turn on the water.
2. Fill the sink and drain it while observing for leaks.
3. Repeat the test several times to ensure all connections are sealed properly.

Conclusion

You’ve successfully plumbed a sink drain by following these steps. With your connections secured and leak-tested, your sink is now ready for use. If you encounter any issues, consider reviewing each connection for proper fit or consulting a professional plumber. Happy plumbing!