Finding puddles or damp areas around the supply line, such as on the floor or walls, can also help you determine the source of the leak. [3] X Research source [4] X Research source
Consider drying the supply line, walls, and other wet areas. If you leave water sitting on the floor, it could also cause mold to grow in your bathroom over time. Mold can cause health risks. [6] X Trustworthy Source Centers for Disease Control and Prevention Main public health institute for the US, run by the Dept. of Health and Human Services Go to source
You do not want to tighten the nuts too much, or you might strip their threads and damage them. Be sure to turn it to the left. Remember: Righty tighty, lefty loosey!
Try wrapping the plumber’s tape around the supply line or fittings a few times if you want to make the tape extra secure. [10] X Research source If the leak is coming from a hole in the supply line itself, try wrapping plumber’s tape, duct tape, or electrical tape around the supply line to patch the hole up. [11] X Research source
You can also use a cup to empty out smaller amounts of water left in the tank, and a sponge to soak up residual amounts of water. [14] X Research source
Warning: Be a little careful when lifting the supply line out of place, as you don’t want to damage the places where it screws onto the supply valve and the toilet. [16] X Research source
Tip: Bring the old supply line with you to easily compare it to the new ones. If you aren’t sure which supply line matches your old one, ask an employee for help.
Tip: If your new supply line came with a tag displaying the dimensions of the supply line, consider leaving the tag on. This will make it easier to find the right supply line the next time you need to replace it.
If the new supply line leaks, you might not have tightened it enough, the new supply line may be defective, or there may be a problem with another component of the toilet. Call a professional for help.
