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How To Extend Kitchen Faucet Supply Line? [In Just 9 Steps]

Installing an extension in a kitchen faucet can be very useful. You can add sprayers, and extended 360-degree faucets with it. Having a clear guideline would be better in that case.    

How to extend kitchen faucet supplies? 

Before you extend kitchen faucet supplies, you have to know how to remove the faucet. After removing the faucet, you have to remove the pipes with new ones. Then you can easily extend the supply line by adding different materials like sprayers to your faucet.

There’s more to know if you want to extend your faucet supplies on your own. Let’s dive in!

How To Extend Kitchen Faucet Supplies?  

Applying an extender in a faucet supply line is very useful. If you’re looking for how to install the extension line, you’re on the right track.  

First, you need to know how to replace a kitchen faucet. If your faucet has plastic nuts, you have to replace the plastic nuts with copper nuts. Replacing it is a must in case of adding a sprayer, soap dispenser, etc.

Once you’ve replaced it, just install the extension.

Required Tools

Before you begin the replacement process, make sure you have everything you need. Here are the tools you require for this process:

  • Adjustable wrench
  • Plyers
  • Teflon tape 
  • Shallow pan
  • Towel 
  • Flashlight
  • Basin wrench
  • Sink installer
  • Tubing cutter
  • Penetrating oil 
  • Supply lines 
  • Faucet gasket

Step 1: Clean The Underside Of The Sink 

Begin with cleaning all the sides under the faucet and place a towel. Place your shallow pan or bucket above the towel to collect the water from the pipe.  

Step 2: Turn Off Water Supplies  

If you have an electrical line for the sink, turn off the heater. It could be a hot water supply line or any other line, Then, turn off the main water valve. Sometimes you may face difficulties if the sinkhole is smaller. You’ll have to fix it in this case.

Now, shut off the hot and cold water valve. Open up the faucet handles to make sure there is no water in the pipe.

Step 3: Unscrew The Nuts

Now, you have to disconnect the supply lines from the faucet. Use your adjustable wrench to loosen up the nuts in the valves.

After removing the pipes, use your bucket to save the rest of the water from the disconnected pipes. If the valve drips water, it’s probably a faulty one. You might also have to replace the valve in this case. 

Step 4: Disconnect The Lines

Now, take out the old supply lines connected to the faucet. First, unscrew the supply line connection using a basin wrench. 

We suggest you not use the old pipes again. Cut the old pipe with a tubing cutter. 

Step 5: Get Rid Off Mounting Nuts

Now loosen up the mounting nuts. If you have a single-handle faucet, it’s connected in a single shank containing hot/cold water supply lines. 

If the mounting nuts are hard to open, use penetrating oil to lose them. After removing the mounting nut, remove the faucet from the sink. 

Now, clean the area thoroughly with a cleaner. 

In case you’re looking for a kitchen sink cleaner, we have some suggestions for you. 

Product 1
Product 2

Now that you have your cleaner, let’s go to the next step. 

Step 6: Place The Faucet Gasket Into The Spout Base

There are many varieties of faucets. But here, we are showing you a single-handle faucet extension. 

Take the hot and cold supply lines and put them on your new faucet directly. These supply lines have a diverter that can connect an extended supply line. 

Place a faucet gasket into the spout base and cover it over the supply lines. Make sure all the components fit properly. 

Step 7: Place The Faucet

Now, place the faucet on the mounting surface. Go below the faucet to tighten up the mounting nuts. Use your pipe wrench to do it. If your mounting hardware doesn’t match our example, read the user manual. 

While doing this, make sure someone is holding the faucet to line it properly. 

Step 8: Connect The Lines With The Main Water Supply

It’s time to connect the lines with the main supply lines. To do this, wrap some Teflon tapes before attaching the lines with the connecting nut. Make sure you attach the lines separately to the cold water line and the hot water line.  

Screw on the nuts with your hand and then tighten it up with an adjustable wrench. Now, you can apply an extended supply line for adding sprayers or other materials.       

Step 9: Install The Extended Line 

Suppose you want to set up a sprayer as an extension. After setting up the faucet supply lines, set the sprayer hose in the sinkhole. Tight the connecting nut with a wrench. 

Now, insert the pipe of the sprayer through the hose. You’ll see a faucet diverter in the new supply lines, attach the pipe with that.  

That’s it, your extension is now installed! You can also remove the sprayer whenever you want! 


Question: What size are water lines under the sink?
Answer: ½ inch is the most common diameter of the water lines. If you’re going to replace any water line pipe, make sure it is with this range.

Question: How much does it cost to replace a faucet?
Answer: It will cost 250$ on average to replace a faucet. But, If you replace it yourself, you can save up to 150$.

Question: What to do if a valve is leaking?
Answer: Tighten the nut with an adjustable wrench. Or open the nut and apply some Teflon tapes on it. See if there’s anymore leak. If it doesn’t solve your problem, you may have to replace it.  


So that’s it! This is the process of how to extend kitchen faucet supplies. If you want to extend supply lines, this is the right process to do it. 

We hope our guide will help you extend your kitchen faucet supply lines. Good luck!