I'm replacing the faucets and associated isolation valves in my bathroom vanity and have a general question. The valves are threaded connections with brass ferrels and nuts. I cant figure out how to get the existing ferrels and nuts off the copper pipe without cutting the ferrel and I'm afraid of marring the pipe. Is there a risk of these ferrels leaking if I hook them up to the new valves? They dont currently leak but the valves are getting old and corroded.
thanks, dave