How to Install a Shower Drain

Installing a shower drain involves removing the old drain, cleaning the area, applying plumber's putty or silicone, and securing the new drain assembly with proper sealing.

1. Free the Old Drain Fast. Use a drain removal tool or needle-nose pliers to unscrew the old drain assembly. Turn counterclockwise to loosen. If the drain is stuck, apply penetrating oil and let it sit for 15 minutes before trying again. Clean out any old putty or debris from the drain hole.
2. Clear Every Trace of Old Seal. Scrape away all old plumber's putty, caulk, or debris from around the drain opening. Use a putty knife and clean cloth to ensure the surface is completely smooth and clean. Check that the drain opening is the correct size for your new drain assembly.
3. Seal Before You Install. Roll plumber's putty into a rope about 1/4 inch thick and press it around the underside of the new drain flange. Alternatively, apply a bead of silicone sealant around the drain opening if your local code requires it instead of putty.
4. Press Down for Watertight Fit. Insert the drain assembly into the opening from above. Press down firmly to compress the putty and create a watertight seal. Wipe away any excess putty that squeezes out around the edges.
5. Lock It Down—Just Barely. From underneath the shower pan, thread on the rubber gasket and locknut. Hand-tighten the locknut, then use a wrench to tighten an additional quarter turn. Do not overtighten as this can crack the shower pan.
6. Verify Before You Call It Done. Run water down the drain for several minutes to test for leaks. Check underneath the shower pan for any water dripping. If you see leaks, tighten the locknut slightly or reapply sealant as needed.