If you have a compression fitting that is attached to a copper water pipe and is leaking, you will need to replace it. However, compression fittings used on copper water pipes are not meant to be removed, as they cannot be reused to create a seal. Therefore, you will usually need to cut the copper pipe above the compressed pipe area and install a new compression fitting. This simple guide will show you how.
Step 1 - Turn Off the Water
Before you begin, turn off the main water supply valve in the front of your home. This valve is normally located where your water meter is.
Step 2 - Cut the Pipe
Choose a spot above the compression fitting that is as close to the coupler as possible to make your cut. Then, take the hacksaw and slowly cut the pipe and make sure to cut it as straight and even as you can.
Step 3 - Prepare to Install New Fitting
Once you have cut the copper pipe, you can begin preparing to install the new compression fitting. You'll need to clean the edges of the pipe with a piece of sandpaper and then install a new compression fitting. If the pipe is left too short, you can extend it with a copper pipe coupler. However, you will you need to use a blow touch and some solder flux to sweat the two pieces together.