How to Connect Two Sinks in the Kitchen With PVC to a Steel Pipe Drain

Wrap pipe tape around the threads on the sinks’ tailpieces, wrapping the tape clockwise at least three times. Thread PVC trap adapters onto the tailpieces clockwise by hand until tight.

Slide one end of a rubber coupler onto a 90 degree pipe elbow piece, and then use a screwdriver to tighten the hose clamp over the connection between the pipe and the rubber coupler. Insert the open end of the rubber coupler over the metal stub-out pipe, and then tighten the other hose clamp with the screwdriver.

Thread a pipe trap onto the compression nut on the end of the pipe elbow. Tighten a pipe riser onto the top of the trap piece. If the stub-out pipe sits closer to one sink’s drain, thread a sanitary tee to the top of the pipe riser and then thread the sanitary tee onto the trap adapter.

Tighten 90 degree pipe elbows onto the trap adapters you installed earlier, angling the pipe elbows’ openings so they point at the other sink’s drain. Thread a double 90 degree pipe tee onto the top of the pipe riser, if the stub-out pipe sits between the sinks’ drains.

Measure the distance between either the 90 degree pipe elbow and the sanitary tee or the dual 90 degree elbows and the dual 90 degree tee. Cut straight lengths of PVC pipe to fit in the open gaps using a hacksaw. Thread the straight pipes onto the sink’s drainpipe assembly.

Unthread the pipe connections one at a time, and brush PVC primer onto the pipes where they overlap. Brush PVC cement onto the pipes once the primer dries, and then thread the pipes back together. Turn on the sinks’ faucets and run the water down the drains for at least two minutes to check for leaks in the drain pipes’ connections. Tighten any leaking connections with a pipe wrench, turning the compression nuts a quarter turn at a time, until the leaks stop.