How to remove compresson ring on 1/2" copper?

[Pskhaat]

So I'm putting a new under-sink water valve in so I can tee off a second sink.

How do you remove an old stuck 1/2" compression ring from the copper stub? If I grind it off I may damage the very stub on which a new one needs to go. I've got very little length out of the wall so I can't just shorten it.

I've tried some muriatic acid on it. It will spin, just won't come out. Thoughts?

 

[Dirtsquirt]

I feel your pain

Typically I DON'T. I put on the new valve and If Luck is with me
I can tighten the nut enough to get it to seal. I only tighten it enough to curtail the leaking. (save some compression for the next go round)
That failing a tubing cutter and a new ferrule is in order.
IF it is to tight for a tubing cutter an abrasive cutoff wheel on a die grinder will do the job.

Good luck. Hope it dont come down to ripping sheet rock

 

[45Kevin]

Why cant you use the existing nut and ring with the new valve?

The copper pipe is deformed (compressed) where the ring is and that is why it won't slide off.

 

[Pskhaat]

The copper stub is too long for the new valve so the valve can't make sufficient contact with the ring. I may need to grind/file it down then?

 

[-Spike-]

Home Depot sells a puller for that, at least they do in my area. It looks like a mini gear puller, and also has a slug that goes in the end of the pipe to push against. Under $20 IIRC, in the plumbing aisle with the rest of the plumbing tools. Usually works pretty easily. If not Home Depot, then any decent plumbing supply place will have it (for more $$).

 

[GDA62/100]

I tried to reuse the old ring to no avail. I rented a puller from the local Ace hardware for $2. Worked great. Put the new one on and no leaks. Maybe I was just lucky.