Learn the key plumbing differences to successfully install double sink plumbing.
(Though it’s possible for you to also use a combined swing tee trap.)
This configuration directs the flow of waste from both sinks into a single drainage line.
The Spruce / Kevin Norris
Beyond this major difference in the plumbing configuration, single-basin and double-basin sinks follow the same basic installation process.
Intermediate-level DIYers should feel comfortable tackling this installation process with the straightforward steps below.
Some drop-in sinks may also have clips to secure the sink to the bottom of the countertop.
The Spruce / Kevin Norris
Use a screwdriver to secure these clips.
This is accomplished with heavy-duty clips, adhesive, and the plumber’s putty or silicone caulk.
Have a helper hold the sink in place while you fasten the heavy-duty clips to secure the sink.
The Spruce / Kevin Norris
Use a tape measureto determine the height of the drain outlet pipe.
This isn’t a repair that is typically handled by a DIYer.
Use a marker to indicate the desired length, then cut the tailpieces with a hacksaw or PVC cutter.
The Spruce / Kevin Norris
Connect the drain tailpieces to the basket strainers with slip-on compression nuts.
Repeat this process for the second sink.
implement the Drain Trap
After the sanitary tee, you will need to implement the drain trap.
The Spruce / Kevin Norris
Connect the sanitary tee to the U-shaped trap and then connect the U-shaped trap to the J-shaped trap.
The tail-end of the J-shaped trap completes the drainage line by connecting to the drain outlet pipe.
The Spruce / Kevin Norris
The Spruce / Kevin Norris
The Spruce / Kevin Norris
The Spruce / Kevin Norris
The Spruce / Kevin Norris
The Spruce / Kevin Norris
