How to Replace Sink Water Supply Lines

hoses underneath a sink
What You'll Need
Drip pan
Open end wrench
Old rag
Basin wrench

You will find that whenever you are looking to replace any water supply lines that it can be a bit of a difficult task. You will have to crawl underneath the kitchen or bathroom cabinet and deal with a tight and cramped space that has little light. You will find however, that it is not too difficult of a job if you have the right tools and know the proper steps you will need to take so you can get the job done quickly and efficiently.

Step 1 - Shut off Water

The first thing that you will need to do in order to properly prepare the area is to shut off the water valves that go into the faucet you will be working on. You may end up needing to get a drip pan you can put underneath the valves as they may leak whenever you turn them off. The leaking will typically happen because they are not normally turned off unless they need to be fixed. Typically the shut off valve will be underneath the sink. If it is not, then you will be able to simply cut off the main water supply to your home.

Step 2 - Remove Old Lines

two men working under a sink

You will need to get an open end wrench so that you will be able to successfully remove the supply line from the valve. If you have an older home, there is probably a copper line that is running from your faucet to the shut off valve. These are prone to becoming corroded. This happens often at the fittings which can also cause mold. It can be a bit of a hassle to remove the supply lines that are corroded so you may have to put a little bit extra muscle into it.

Step 3 - Mold

If there is mold, it is a good idea to clean it off before you begin to attempt to remove it. While you are only going to throw the line away, you will find that it will be much easier if you do not have to worry about working around a lot of mold. Typically a rag and some bleach will do the trick.

Step 4 - Remove Supply Line from Valve

basin wrench

You are now ready to completely remove the supply line from your valve. You will find that a basin wrench will help to make this task much simpler. With the spring-loaded jaws on this wrench, you will be able to swivel it 90 degrees so that you will be able to both loosen and tighten the nuts when needed.

Step 5 - Attachment

Once you have successfully removed the old supply line, you will be able to put the new one in its place. Regardless of the difference in the two lines, you will find that they will be attached in the same way. You will then need to get the water supply valve attached as well. From there, you can turn on the water and look to see if there are any leaks.