How To Install Double Kitchen Sink Plumbing?

Double kitchen sinks offer extra space and aesthetics for your kitchen. Whether you are installing one for the first time in a new home or are remodeling an older home to replace the existing sink with something new, double kitchen sinks can be installed by any homeowner with the right tools, resources, and time available. Using two sink sections instead of one, the actual installation process and how the sink works is exactly the same as for a single sink.

How To Install Double Kitchen Sink Plumbing

Install Double Kitchen Sink Plumbing – Step By Step

Step 1: Familiarize yourself with the parts in the kit. The knuckle “T” section is what each piece of the “J” (also known as an exhaust pipe) attaches to, once they have been attached to the bottom of their respective drains at the bottom of the sink. (drain baskets) and is centered between the two drain holes. 

The sink siphon is a U-shaped piece and connects to the wall drain pipe (a straight pipe that sticks out of the wall at the back of your closet) as well as the “T” section, to remove sewage water.

Step 2: Dry assemble your installation before tightening the slip nuts of the circular that are attached to each piece on the threads and joining the plastic pieces. First, connect the straight section of PVC pipe into the wall drain pipe and join the sink trap (long piece, U-shaped), which in turn connects to the joint of the “T”. The trap and knuckle should be directly under the sink, centered front to back and side to side under the two drain baskets.

Step 3: Cut the excess pipe with a hacksaw. Loosely connect the threads of each piece with a nut to hold them in place while making adjustments. After you have dry-installed the drainpipe, sink siphon, and knuckle, check to see if you need to cut off any excess pieces of the exhaust pipe. Cut to fit by hacksawing the long ends of the tail, then dry them to fit the sink baskets as well as the “T” joint.

Step 4: Tighten all skid nuts to hold installation together. Use a pair of Channellock pliers to tighten the nuts in place. Turn them into a movement to the right. Avoid twisting them too much or you may break the pipes. Apply enough strain to guarantee a cozy fit. Run the water through the pipes and check for leaks before using the sink.

Tips & Warnings

All your tools and supplies can be purchased or rented from a local home improvement store. Double kitchen sink kits are sold in a variety of sizes depending on the type of sink to install – so talk to a professional at the store to make sure you buy the right size kit for your particular type of sink. 

Although not required for plastic installations (the threads and slip nuts work together to keep water in the pipes) plumber’s tape (Teflon) can be used for additional protection if you choose. Pre-assembled sink kits generally require only minimal adjustments, so measure twice and cut sparingly to avoid overcutting.