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Waste coupling installation: plumber fitting pipes under a sink
Plumber30-day warranty included

Waste coupling installation

Takes about 30 min

The waste coupling is the metal or plastic outlet at the bottom of your basin or sink. When its seal fails, water drips from under the basin every time you drain it. A verified plumber undoes the trap, unscrews the old coupling, cleans off the old putty or sealant, seats the new coupling with fresh washers and reconnects the trap.

The job takes about 30 minutes and starts from the price shown on this page. Buy the waste coupling to suit your basin before the visit: slotted for basins with an overflow hole, unslotted for those without. The plumber checks this before fitting. Empty the cabinet underneath and keep a bucket ready.

What's included

  • Trap disconnected and old coupling removed
  • Old putty and sealant cleaned off
  • New coupling seated with fresh washers
  • Trap reconnected and tightened
  • Fill and drain test
  • 30-day warranty on the fitting

What's not included

  • The waste coupling, bought by you
  • A new bottle trap, quoted if needed
  • Basin replacement

How the visit goes

  1. 1

    Check the coupling type

    The plumber confirms your new coupling suits the basin, slotted or unslotted.

  2. 2

    Remove the old one

    The trap is undone and the old coupling is unscrewed and cleaned out.

  3. 3

    Seat the new coupling

    The new coupling goes in with fresh washers and is tightened evenly.

  4. 4

    Drain test

    The basin is filled and emptied to check the coupling and trap stay dry.

What we need from you

  • The new waste coupling
  • Cabinet under the basin emptied
  • A bucket

Questions about this service

Slotted or unslotted, which do I need?

If your basin has an overflow hole near the top, buy slotted. If not, buy unslotted.

Does this work for a kitchen sink?

Yes, the same job applies to a sink waste. Buy the sink waste that suits your sink.

Can I keep my old trap?

Yes, if it is sound. The plumber checks it and tells you if it should be replaced.

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