Replace a valve in copper pipe
Photo 1: Position the coupling
Slide the no-stop coupling over the pipe, then install the new valve and pipe assembly.
Photo 2: Slide the coupling into place
Move the no-stop coupling over the pipe assembly, then solder it to the assembly and the existing pipe.
If you have to replace a leaky valve, it can be difficult to spread the cut section wide enough to insert the new valve. The solution is to use a special “slip” or “no-stop” coupling (available at home centers for less than $3). Unlike traditional couplings, no-stop couplings don’t have a flange or dimple that stops the plumbing pipe once it’s inserted halfway into the coupling. This lets you install the coupling and move it back out of the way, then have room to insert the new section of pipe. Turn off the water, then cut the pipe about 6 in. from each side of the leaky valve, using a pipe cutter or a hacksaw. Place the no-stop coupling over the existing pipe. Cut a new section of pipe to replace the piece you cut out (be sure to factor in the length of the water valve). Solder the pipe to the valve, then stick the assembled section between the two existing pipes (Photo 1). Move the no-stop coupling over the new pipe, then solder all the joints (Photo 2).
The standard or “stopped” couplings have indentations, which stop the copper pipe when inserted. The “no-stop” coupling doesn’t have indentations.
Required Tools for this Project
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
- Safety glasses
- Soldering torch
- Tube cutter
Required Materials for this Project
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here’s a list.
- Copper tubing
- New valve
- No-stop coupling
- Stopped coupling