What size drain do I need for a bathroom sink?

Standard bathroom sink drains use a 1-1/4 inch opening. Kitchen sinks use a 3-1/2 inch opening. Measure your sink drain hole before purchasing.

How do I fix a slow-draining sink?

Remove the pop-up stopper and clean hair and debris from the drain and stopper mechanism. If still slow, clean the P-trap. Avoid chemical drain cleaners that can damage pipes.

Plumbing

Drains

$8-$50 per assembly

Drain Assemblies (2026)

Prepared by Lumberama's Building Materials Team

|Last updated July 25, 2026|Sources & methodology

Drain assemblies connect sinks, tubs, and showers to the waste piping system while controlling water flow with built-in stoppers or strainers. Available in pop-up, push-button, click-clack, and grid strainer configurations. Finished in chrome, brushed nickel, and other popular finishes to match your fixtures.

Key Features

Multiple stopper mechanisms
Decorative finish options
Complete assembly with gaskets
Fits standard drain openings
Easy retrofit installation

Specifications

Types: Pop-up

push-button

click-clack

grid strainer

toe-touch | Sink Drain Size: 1-1/4 inch (lavatory)

3-1/2 inch (kitchen) | Tub Drain Size: 1-1/2 inch | Finishes: Chrome

brushed nickel

oil-rubbed bronze

matte black

Applications

Bathroom sink drains
Kitchen sink drains
Bathtub drains
Shower drains
Utility sink drains

Installation Overview

Apply plumber putty around the drain flange. Insert from above and thread the mounting nut from below. Connect the tailpiece to the P-trap. For tub drains, connect the overflow assembly and waste shoe. Test for leaks.

Pros & Cons

Pros

✓ Complete kit with all parts
✓ Multiple finish options
✓ Easy replacement upgrade
✓ Various stopper mechanisms

Cons

✗ Must match drain opening size
✗ Pop-up mechanisms can clog
✗ Finish must match other fixtures
✗ Some require access from below

Top Brands

Moen

Delta

Code Requirements

Must connect to properly trapped and vented waste piping. P-trap required at each fixture. Overflow required on bathtubs. Drain assemblies must be accessible for maintenance.

Buying Tips

Match the drain finish to your faucet finish for a coordinated look. Push-button and click-clack drains are easier to operate than traditional pop-up mechanisms. Keep a spare drain assembly on hand for quick replacements.