We are replacing shut-off valves that have compression fittings. We are unable to remove the nut and ferrule from the threaded pipe that comes out of the wall. Is there a trick to removing these?

Yes, you have to cut them off. Once a ferrule is compressed by tightening the nut that done for. The ferrule squeezes smaller and gets smaller than the pipe diameter. Most folks just reuse the old nut and ferrule with the new valve, much easier.

As Ballenger said... you may be able to use the old ones. If not you can purchase a handle/compression nut removal tool (see picture) and pull the old compression nut and ferrule off using that tool.

These are sold at all home supply stores...

MARK

Mark, that's interesting, never seen one and wonder how it works since the ferrule has deformed the copper pipe.

Thanks to both who replied so quickly! We really appreciate it. We were able to use a file to remove the old stuff. Crossing our fingers that when we turn the water back on there will be NO leaks!

Hi Bob:

Works great in most cases where the ferrule has only slightly indented the pipe. If pipe is deformed by the ferrule (we've both seen them... ;) ) Then even this tool will not help. Otherwise, this tool does a great job by grabbing behind the nut itself and then the nut pulls the ferrule off... pretty cool when it works!

A minihacksaw also worked in a pinch a couple times... :)

Have great day!

Let us know how this one turns out.

Good for you!