Kitchen Appliance Installation: How to Install a Sink Drain


Installation of rough plumbing for typical kitchen is not so daunting and expensive task as for your bathroom. Only one drain line and a pair of supply pipes is required as there is often only one sink and one dishwasher. All other components of appliance installation include the drain and supply for the dishwasher, a supply line for an icemaker, a hot water dispenser or a water filter. All connections are made with flexible tubing that does not run through walls.

There are not many obvious reasons for changing out the drainpipes under a kitchen sink, but the possible one during kitchen renovation is sink replacing. The steps for installing the sink drain will depend on the difference from the old one and installation of other appliance components.

Discover necessary steps for installing a sink drain from start to finish:

–          DrainHeight

Deep sinks occupy more space underneath and may require lowering the drain height. Before doing a purchase check the height of trap arm on the old sink. If it is more than 16″, it may be difficult task to get the necessary slope for the trap arm on the new one.

–           Drain Lowering

If existing drain is not low enough for the depth of new sink, the wall should be opened and the position of the sanitary tee should be lowered. As this complicated part of installation requires cutting away the back of the cabinet and the wall surface, it is better to hire a professional plumber.

The general height is 12″ – 13″ from the floor or base of the cabinet. It allows installation of deep sinks and a large garbage disposer. Remember that there should be left enough room to remove the trap necessary for cleaning out in the future.

If the drain tee is lowered, glue or tighten the fittings. If they are left loose it will cause movement and adjustments of the other parts of the sink drain.

Then install the new sink.

–          Disposal and Strainer Installation

The installation of these components as well as any other under-sink appliances (water filter or hot water dispenser) should be done before installing any drainpipes.

–          Continuous Waste Pipe and Trap Connection

This part of installation may be a risky and tricky task for you, if you are not very confident of your skills, it is a good idea to hire a professional plumber.

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