How to Install a Drain in a Bathroom With a Double-Bowl Sink

A bathroom sink with double bowls comes in handy if you have more than one child sharing the bathroom or if you hand wash a lot of clothes in your sink. These sinks work in the same way as a single-bowl sink. The drain in the bottom of each sink is connected to a straight piece of pipe called the tailpiece. The difference in double bowl sinks is that the tailpieces on each sink are attached to 90-degree elbows, which allow the pipes to meet up beneath the sink. A curved piece of pipe called the P-trap keeps water trapped in its bend and prevents noxious sewer gases from leaking into your home.

Things You'll Need

• Bathroom cleaner
• Rags
• Silicone caulk
• Caulk gun
• 2 drain assemblies
• 2 tailpieces
• Pliers
• 2 90-degree elbows
• Straight pipe
• 90-degree double tee
• P-trap

Instructions

1. Clean out the bottom of the sinks with cleaner and rags. This will help remove any packing material or manufacturing residue and give your drains much better adhesion.

2. Insert a tube of silicone caulk into a caulk gun with the tip pointing away from the trigger. Cut the tip off the tube. Turn the metal drain flange over so that it is upside down. Apply a bead of caulk around the edges of the flange. Turn the flange over and press it down into the drain opening in the bottom of one of the sinks. Have an assistant hold the flange in place.

3. Position yourself under the sink. Screw in the tailpiece on the underside of the flange. Slide the gasket and jamb nut over the tailpiece until they are flush with the bottom of the sink. Tighten the jamb nut with the pliers. Attach a 90-degree elbow at the bottom with a slip joint. Tighten the slip point with the pliers.

4. Repeat steps 2 and 3 for the other sink and drain.

5. Run pipes 1 1/2 inches long, cut to size, from each of the elbow joints to a double 90-degree tee.

6. Connect the P-trap to the sewer inlet pipe. Tighten the coupling to hold it in place.

7. Measure the distance between the P-trap and the 90-degree double tee. Cut a section of pipe to this size. Connect the pipe to the double tee and the P-trap with the couplings.

8. Allow the caulk on the drains to dry. Trim away any excess with a sharp knife.

9. Run the water and check for leaks. Tighten any couplings if necessary.

Tips & Warnings

• Don't try to wipe up any excess caulk. This will just create a mess.

References

• Fine Home Building: Installing a Sink
• HammerZone: Installing a Drain
• Landlording TV: Installing a Double Bowl Sink