It isn't necessary to remove the old ring and nut from the pipe, in order to install the new shut off valve. I remove the old body from the pipe, leaving the ring and nut, then install the new valve onto the old ring and nut with a little pipe dope (not teflon tape). American valves are standardized, when it comes to compression sizes. Therefore the threads 1/2" compression valves from Chicago Specialties are the same as Kohler.

However if you insist in removing the compression ring, there is a tool that will pull it off. Unfortunately, you can not buy it at a hardware store, but must go to a plumbing specialty supplier.

Good Luck

Raymond VinZant Plumbing Prof.

I tried what you suggested but I couldn't get the old nut to screw onto the new valve.I wound up putting the old valve back on but I did use the tfe paste. I wanted to remove all the old parts so I could also replace the plate that goes against the wall. Thanks for the info.

Wendy