Step 6 · Assemble New Drain Plumbing

Now you will assemble the new drain pipes. First, attach the new flanged tailpiece to the bottom of the sink strainer you just installed, securing it with the provided slip nut and washer. For the double-basin sink, you will use a 'continuous waste' or 'branch' tailpiece that has a side inlet. Connect this to the drain on the other sink basin. Connect the dishwasher drain hose to the side inlet port on this branch tailpiece and secure it with the hose clamp. Make sure to create a 'high loop' with the dishwasher hose by securing it as high as possible under the countertop before it connects to the tailpiece; this prevents dirty water from flowing back into the dishwasher. Finally, connect the P-trap to the bottom of the new tailpiece assembly and to the drain pipe in the wall. You may need to dry-fit and cut some of the PVC pipes to the correct length using a tubing cutter or hacksaw. Hand-tighten all slip nuts, then give a final quarter-turn with channel-lock pliers.

Tools and Materials

Channellock 10 in. Tongue and Groove Plier 430SnappyTrap 1-1/2 in. All-in-One Drain Kit for Double Bowl Kitchen Sinks DK-110SnappyTrap 1-1/2 in. All-in-One Drain Kit for Single Bowl Kitchen Sinks, Bar Sinks and Utility Sinks DK-100Everbilt 5 - 7 in. Stainless Steel Hose Clamp 6799595