How to connect two faucet supply lines together?

Jessica Lawrence
8 Min Read
How to connect two faucet supply lines

You can get out of various hassles when you learn some house chores. Suppose you don’t know how to connect two faucet supply lines; you need a plumber every time. Of course, the plumber demands your time and money.

Nothing is softer or more flexible than water, yet nothing can resist it.


Perhaps the DIY videos and online comprehensive guides will make you a non-certified plumber to tackle home enthusiasts by yourself.

The same goes with this guide, in which we will step-wise discuss some techniques, tactics, and tricks to connect two faucet supply lines together.

By the end of this guide, you will not need any plumber to perform your household task.

Also read: Satin nickel vs. brushed nickel, which one is better?

 Let’s get into it.

How to connect two faucets supply lines together  

Before starting to connect two faucet supply lines together, you will need two essential things.

The first is leak-free connections, and the other is the right tools in your hands.

Steps to connect two faucets supply lines together: 

We compile the discussion below in several steps. The step-wise discussion will help you understand better and effectively.

Step 1: Turn off the water supply:


In the first step, turn off the water supply to reduce the water pressure. It’s necessary. Otherwise, you can’t handle the work under water pressure, and things become more challenging.

Step 2: Measure the water supply line immediately: 

Measure the water supply line


For line measurement, carefully see the distance between the faucet and the shutoff valve. After that, check and calculate the length. Then add three to five inches to the tubing. That’s how you can create the room for angle and get electricity. 

There is no standard measurement. The length varies according to available supply lines in the market. 

Moreover, supply lines come with faucets when you purchase them, so use them when needed. Sometimes the supply lines are short in length. In such cases, you need to buy extensions with them. Don’t worry water supply line extensions will not cause any water supply trouble. 

Step 3: Bends the tubings properly: 

Bends the tubings


Bends the tube’s ends so that the tube ends connect properly with the faucet intake part and the valve. For this task, you will need a flexible tube for perfect bending. Once the connection is created between the valve and supply line of faucets and applied Teflon tape on the links. The tape is also known as plumber tape. Plumbers widely use it to lubricate and bolt threaded line joints or tubes. 

Try to separate your hot and cold water supply lines and half a foot apart from each other. That’s how our cold water supply line will not take the heat of the hot water supply line. This step is not compulsory for those having insulated hot water supply lines

Step 4: Tighten up the tools in their right places: 


Get the tools to their proper locations right away. Put the compression fitting, ring, and locking nut of the faucet on the end of the water supply line. Since you haven’t yet linked the tube to the line, store it somewhere accessible.  

To join the lines, you must purchase a compression fitting of the appropriate size, so be cautious while measuring the line diameters. The nearby hardware stores will sell the necessary equipment. If not, plumbing supply shops and DIY centers will undoubtedly have them. 

Compression fittings are simple to install. Although minimal maintenance performs better than most pipes, they do not survive as long as the soldered fittings. Additionally, they have a minor probability of leaking. 

Step 5: Locating the Faucet:


This is the last action. Affix the faucet to one of the ends of the tube. After installation, tighten the nut on it. Take the second end and secure it to the shutdown valve’s discharge port.  

Step 6: Bolt it firmly as well:


You should tighten them with a basin wrench for optimal results. Put one twist on the shutdown valve and the other on the compression fitting for the faucet. Hold the valve firmly in place. The compression fitting should then be turned clockwise

To avoid water leaking, the connections on the kitchen faucet should be made securely. However, it can’t be overly rigid.  

The dangers of weakening the supply line increase as a result. The best action in this situation is to continue tightening it as long as possible. Use the wrench one last half or quarter-turn after that. 

Turn on the water supply and look for any leaks in the connections to ensure you did it correctly. Congratulations if they are secure and don’t exhibit any signs of leaking. You succeeded! Now reward yourself with a cool beverage and take a relaxing snooze. 

You can watch the practical through this link

Connection through compression fitting : 

You can connect two faucet supply lines using a compression nut fitting method. It’s the easiest and quick procedure that can save you time and effort. First, you need to measure the pipe and buy a compression fitting that matches the measurements. 

 Although joining the supply lines of two faucets includes several producers, they are not complicated. The process is all about insertion and twisting. 

So here’s the direction about how to use compression fitting to connect two faucets supply lines. 

  • Start with fixing the compression fitting with the supply line 
  • Make sure the threads of the nuts face the valves properly 
  • Then put the compression ring around the supply line 
  • Fit the supply tube in the valve 
  • The supply line fits perfectly. Otherwise, you will face a water leakage problem. 
  • Make sure again the compression ring is fitted correctly. 
  • At last, push in and twist a bit to ensure proper connections.

Bottom lines: 

Through the article, we hope that you have learned a lot. It’s not difficult to figure out how to connect two supply lines for a faucet and to complete the task. In many situations, no instrument is even necessary.  

All you have to do is adhere to the directions in this manual. Even if you are not a skilled plumber, you can create watertight connections with a little practice.

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