Bisman 1-1/4" x 6" Tail Piece: Extend Your Sink Waste
By Maintenance Depot Plumbing Team · Last reviewed
Quick answer
The Bisman BMNA114 1-1/4" x 6" tail piece extends the waste connection from a bathroom basin to the P-trap. It connects with slip nuts and can be trimmed to length.
The tail piece is the short pipe between your sink's drain and the P-trap. The Bisman 1-1/4" x 6" tail piece (BMNA114) extends the waste connection from the sink so everything lines up.
Specs at a glance
| Spec | Detail |
|---|---|
| Product | Sink tail piece |
| Brand / model | Bisman BMNA114 |
| Size | 1-1/4" x 6" |
| Typical use | Bathroom basins |
| Connection | Slip joint |
When you need a tail piece
- Fitting a new basin with a different drain height
- Replacing a corroded or cracked tail piece
- Lowering or raising the trap after changing a vanity
1-1/4" vs 1-1/2"
- 1-1/4" is common for bathroom basins.
- 1-1/2" is common for kitchen sinks.
Check the size of your sink's drain before buying.
How to install
- Place a bucket under the trap and loosen the slip nuts.
- Remove the old tail piece.
- Thread the new tail piece onto the sink drain, using a new washer.
- Cut to length if needed so it sits into the trap inlet.
- Hand-tighten the slip nut on the trap, then run water to check for leaks.
Tips
- Use the correct washer for each joint.
- Don't over-tighten plastic nuts.
- Keep the trap level and the outlet sloping toward the wall.
Maintenance Depot also stocks pop-up drain assemblies, trap adapters and extension tubes to finish the job.
Frequently asked questions
What size tail piece do I need?
Bathroom basins usually use 1-1/4"; kitchen sinks usually use 1-1/2".
Can I cut a tail piece shorter?
Yes, cut it with a fine-tooth saw and remove burrs.
Why is my sink drain leaking at the trap?
Check the washers are present and facing the right way, and that the nuts are snug but not over-tightened.