How to Install Sink Drain Pipe on the Kitchen and Bathroom

The sinks in your bathroom and kitchen are connected to the water supply system at your home. Essentially, both of them work in a highly similar way. The primary difference is the bathroom sink is only attached to a drain and faucet, while the kitchen sink is typically connected to more fixtures, like a dishwasher, garbage disposal, and water filter.

Drain pipes are an extremely important component for both, and the article below will walk you through the guides on how to install sink drain pipe for kitchen and bathroom sink.

How to Install A Kitchen Sink Drain Pipe

There are standard drain line sizes of kitchen sinks, meaning that all sink models are designed to follow a specific similar dimension. It is quite understandable since sinks are one of the most common home appliances, so having standardized features will support better interchangeability and functionality.

how to install sink drain pipe

The diameter of all modern sink drain is 3½”. This is similar to the standard shower drain, but it is more significant than a bathroom drain, with a height of 1¼”. So, if you need to install a sink drain, you won’t need to shop for a particular diameter, as the available products in the market will follow the standard size.

Installing drain pipe for your kitchen sink is a simple task that requires only several essential tools of plumbing. Once you have the devices on your hand, follow the easy step-by-step guide below:

  1. Go to the tap that primarily supply the kitchen water and turn it off, then put a bucket under kitchen sink plumbing.
  2. Set the garbage disposal unit on the side of the sink which you desire, then set the basket strainer and other items under sink like a water filter or hot water dispenser.
  3. Cut the drain tailpiece and continuous waste pipe to the suitable length before installing them.
  4. Install both the drain tailpiece and continuous waste pipe
  5. Set the drain trap that consists of U-shaped trap bend and J-shaped trap arm by putting them both carefully then gently tighten them by using slip nut and washer nut.
  6. Test the newly installed sink by running a water on the sink basin to check if the pipe joints have any leak. If there’s indeed a leak, then you need to secure the connection until the leak is no longer present.

How to Install A Bathroom Sink Drain Pipe

The installation of plumbing bathroom sink drain consists of two phases. First, is the stage called “rough-in”, that’s essentially connecting the sink drain to the wall pipe, whether it is the drain, vent, or water pipes.

The second stage is usually called “finishing” where the faucet and sink are connected to the stub-outs. Typically, if you’ve done the first phase properly, you shouldn’t have much problem performing the second one.

The process of installing a bathroom drain pipe will be more straightforward if you have installed the drain and faucet onto the sink before installing the sink because that means you don’t need to lie on your back while completing this task.

How to Install A Bathroom Sink Drain Pipe

The pipe that stretches down from the bathroom sink drain is referred to as the tailpiece, and it usually ends at a similar level as the upper part of the drain, making it easy to connect the trap. Meanwhile, the supply pipes connect to the faucet inlets and shutoff valves, which need to be tightened with plier wrenches.

Ensure that these have the correct connectors’ size by checking them before purchasing the pipes. Once you have connected the pop-up drain stopper, you should use the sink immediately.

The steps on how to install a sink drain pipe are not complicated. However, you still need to follow each step carefully to ensure that they are correctly performed and won’t cause an unwanted issue shortly.