How to Plumb Back-to-Back Sinks

Installing sinks that sit back to back requires the plumbing underneath the sinks to connect to a central drain. Accomplishing this requires the use of two standard P-traps and a little elbow grease. Once your sinks are installed, the central drain will carry waste to the same drain line. This simplifies the plumbing and cuts down on the number of drain pipes that are needed for multiple sinks. Once your sinks are connected, both should drain with ease.

2 P-trap fittings
2 sections of straight pipe
Hacksaw or pipe cutters
T-fitting with compression nuts attached

Instructions

- 1
  Place the top of a P-trap pipe onto the end of each of the drain stubs under the sinks.
- 2
  Turn the compression nut on the P-traps clockwise over the drain stubs to connect the P-traps to the drains.
- 3
  Measure the distance from the openings on the P-traps to the opening on the central drain. Cut two sections of straight pipe to the measurements using a hacksaw or pipe cutter.
- 4
  Place each section of the cut straight pipe into the openings on each of the P-traps. Turn the compression nuts on the P-traps clockwise to connect the P-traps to the straight pipes.
- 5
  Place a T-adapter onto the central drain with the top of the T pointed toward the sinks. Turn the compression nut on the bottom of the T clockwise to connect the T-fitting to the drain.
- 6
  Place the openings of the straight pipes into either side of the T-fitting. Turn the nuts on the T-fitting clockwise to connect the T-fitting to the sink drains. The sinks are now connected to the central drain.

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