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How to Fix a Leaking Flexible Hose Under The Sink (with pictures)

Some home repairs are easier than others. The problem is figuring out which is which. When it comes to water leaking under the sink, it could be that you have to replace the water supply line or something bigger. If it is a leaking water supply line, it is an easy fix for a homeowner. It can be done in minutes with the right couple of tools. Here are the steps to repairing a leaking flexible hose under the sink.


Why is the sink line leaking?

Over time the build-up of minerals in your water like limescale and calcium can begin to wear down the parts of your plumbing. The flexible hose under your sink’s seal can corrode because of the minerals in the water.

This is what happened to us. Apparently, they can go every 10 years or so. If your house is getting older, it may be something to pay attention to.

This house is now 11 years old, and I’m starting to notice more and more repairs and maintenance that are needed like when our Toilet Tank Was Not Filling Up.


Two fixes to a hose leaking under the sink.

This first is the quick fix;  check if the leaking flexible hose under the sink is loose. Before you replace the waterline, see if it just needs to be tightened.

If the leak is at the nut of the hose, get a plumber’s wrench and snug the fitting to see if that addresses the issue. Often this has become loose, and the nut just needs some tightening.


Identify the source of the leak

If that doesn’t work, you will need to replace the flexible hose under the sink. Make sure that the hose is leaking and not coming from the tap of the sink or elsewhere. Lay some paper towel down on the bottom of the waterline and see where the water is coming through—next, check the water supply line to see if the water is coming out.

The last thing you want to do is replace a part that doesn’t need replacing. Luckily this is as easy of a repair that you can do, and it doesn’t cost much at all.

This braided supply line was easy to replace. the sticker on it gave all the dimensions that we needed. All I had to do was show this to the planning desk at our local hardware store, and I was in and out in minutes.


What you will need

  • Towel
  • Adjustable wrench (or two)
  • Pliers
  • New braided water line
  • Teflon tape (plumbers tape)

 Leaking Flexible Hose Under Sink


How to replace a  hot water supply hose


build up on braided supply line


Turn off the water supply valve to the leaking flexible hose under the sink.

water main valve in off position

First, lay down a towel to catch any water that will be coming out.  Next, you will need to turn off the water; otherwise, you will have water shooting everywhere if you don’t.

Simply turn or rotate it 90 degrees. If it hasn’t been moved in a while, as was our case, use a plumber’s wrench to adjust it. Turn on the tap to make sure no more water is coming through. You are set to go.


Remove the old flexible braided hose.

Use a wrench to remove the flexible water hose from the water shut-off valve and faucet line. Ours was very tight, so we had to use two wrenches to loosen it a bit.

water shut off valve under sink

Check the shut-off valve and sink line.

rubber gasket in faucet line


The rubber gasket can get stuck behind (see the photo)

Once you have it removed, inspect the water line to make sure nothing was left behind. The rubber gasket got stuck in the line, and we needed to use a pair of pliers to remove it. You have to be careful when doing this to make sure you don’t damage the tread on the pipe.

rubber gasket for sink braided water line



Next, attach your new braided water line.

Start with the harder-to-reach thread, likely the one that connects to the faucet. Thread it at first with your hands, then use your adjustable wrench to snug it tight. Because of the rubber gasket inside, I was told there was no need for Teflon tape. You should ask when you purchase your flexible hose if it will need plumbers tape or not.

new braided flexible hose under sink


Test it out.

Turn the water back on at the shut-off valve and inspect for leaks. Turn on the water in the sink to make sure things are running properly. If you tightened everything enough, you’re all done. If you don’t have a water sensor underneath your sink, you may want to check back in a few hours to make sure that there is no leak and that everything has been snagged up properly.


Worried about water leaking in other places? Get one of these

We got lucky a few months before this happened. We purchased a couple of wifi water sensors from D Link. You can read the D Link water sensor review here. Catching the leak immediately meant we saved hundreds, if not thousands, in category 1 water damage. I’m sold on their usefulness, and the ability to spot water makes them a valuable part of our home security system.


Final thoughts on leaking flexible hose under sink

Many water issues can be tough challenges; however, fixing a leaking flexible hose under a sink is an easy repair. It took all of 5 minutes to do and was very straightforward.

If you are new to home repairs, this is one even a novice can tackle. That said, if you find the idea of doing your own plumbing too intimidating, you can always contact a plumber using the link below.


Click Here to Find a Plumber


Looking for more repairs and maintenance? Read this:


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