How to Use Silicone Gel on a Bathtub Drain Flange

Use silicone gel to seal a bathtub flange.

The bathtub flange helps to seal the bathtub drain tightly to the bathtub drain pipe underneath. These flanges are usually made of metal, although PVC is becoming a popular alternative. Silicone caulk gel is used to provide a watertight seal on the flange and prevent water from seeping into places where it shouldn't be. Using silicone gel on a bathtub drain flange is an excellent project for a DIY plumber looking to gain experience.

Things You'll Need

• Bathtub flange
• Silicone gel/caulk
• Caulk gun
• Sharp knife
• Bathtub drain key

Instructions

1. Clean out the bottom of the bathtub with a rag and bathroom cleaner. Pay special attention to the drain area. Remove as much mold, mildew and other bathroom debris as possible. This will help the silicone gel adhere better.

2. Insert the silicone gel into a caulk gun. Trim off the end at the 1/8 inch mark. If this silicone gel is in a dispenser tube, trim off the end with a sharp knife.

3. Turn the flange upside down.

4. Gently squeeze out a line of silicone gel around the perimeter of the drain flange. Keep the line toward the center of the flange and try not to let any gel ooze over the edges.

5. Turn the flange right side up. Insert it into the drain flange and turn clockwise.

6. Tighten the drain flange with a drain key or similar tool.

Tips & Warnings

• Don't try to wipe up any silicone caulk that may have oozed through the flange. Wait until it dries and then carefully cut it away with a sharp knife.

References

• HammerZone.com: Replacing a Bathtub Drain, Bruce Maki
• Ask The Builder: Using Silicone Caulk