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How Do I Remove The Old Brass Compression Ring?

I'm replacing an old toilet water valve. The old brass compression ring seems to be stuck on the copper pipe and does not come off. I tried re-using it with my new valve, but there's a slow drip. How do you get that old compression ring off the pipe?

There are a couple of ways to remove a compression ring, however none of them are easy. We recommend using a tool designed specifically to remove compression rings, which is like a bearing puller. It fits behind the compression nut and grips it, then your turn the toggle nut till the nut and ring come off the copper.