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How To Replace A Toilet Supply Line

Do it yourself plumbing information and education

Replacing a toilet's water supply line
If you find your toilet's old supply line leaking, then it is time to replace it! We will help you through removing and installing a flexible toilet supply line here.
Items needed:
  • Towels or rags
  • Wrench or pliers
  • New flexible stainless steel supply line
stainless steel flex

The most common toilet supply line is a stainless steel flex supply line, shown above. Most houses, condos, or apartments will have this type of supply line since they install so quickly and easily. There are many other types of supply lines that require a more in depth removal and install, such as a rigid supply line. However, since those are not too common and are often specific to the toilet they are installed on, we are just going to discuss the most common stainless steel flex line.

straight stop valve

Step 1:
Turn the water supply to the toilet off by turning the knob on your straight or angle supply valve. Typically, the knob will turn clockwise to turn the water off and counterclockwise to turn it back on.

(shown left: straight stop valve)


Step 2:
Flush the toilet a few times to empty the water from the tank. Use a towel to soak up the rest of the water inside the tank so that it does not leak onto the floor when the supply line is removed.


Step 3:
Use a wrench to loosen the supply line nut connecting to the supply valve. Then do the same to the nut connecting to the toilet's fill valve. That connection will be on the underside of the tank and you may need another towel handy as some water may still drip out of the old supply line.


Step 4:
Install the new supply line by hand tightening the white plastic nut to the toilet's fill valve nipple on the under side of the tank. Then hand tighten the other nut to the supply valve. Use your wrench or pliers to tighten both nuts just a quarter of a turn to ensure the connections are sealed.


Step 5:
Turn the water back on by turning the knob on the supply valve.


Step 6:
Check for leaks. If either connection end is leaking, slightly tighten the nut until the leak ceases.


Tip:  If you do not already have a supply line to install and/or are not sure what size to get you can simply measure the length of your existing one. We offer 12" and 20" supply lines. The more commonly used length is the 12" as most toilets are fairly close to the supply valve.

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Please note the information provided here is intended to give a basic knowledge of plumbing related repairs.
This information is general, and may not suit all applications. If you are at all unsure of your abilities to complete one of these projects,
please consult a professional. Always check with local code regulations and the proper authorities before beginning a project.

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