How do I remove compression fittings from an existing copper pipe?
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For the peace of mind,i would replace the copper pipe and compression fitting to eliminate possible leaking,or a part of the pipe with new compression fitting,i'm sure they are meant to be used once only.
They make a tool called a ferrel puller that works great but you can grab the nut with your channel lock pliers and rock it up and down as you are pulling. If that doesn't work you can cut into the brass ferrel with a hacksaw blade just enough to get through the thickest part of the brass and put a flat head screw driver blade into the groove and twist it to snap it open. It should slide right off. Be careful not to cut into the copper or the new one won't seal.
