P Trap into wall extension - How to remove - exposed bathroom sink


I have a chrome plated P - Trap under an exposed bathroom sink.
Need to replace the P Trap and trap to wall extension as a piece of corroded thread from the P Trap managed to broken off in the compression nut. Far as I can tell the extension just goes into the wall pipe and has been sealed with plumbers putty for the past 15 years or so.
P Trap is removed...... I tried using a pipe wrench on the extension...won't budge. Tried some caulk remover and some bolt spray... pipe still won't budge from the wall. This is the 22 gauge slip in type of pipe.
What's the easiest way to remove the slip in extension from the wall pipe.
Do they sell a strap wrench for additional gripping of the extension.
Should I cut the extension off close to the pipe, then make a cut or two on the remaining piece and try to pull it away from the wall pipe.
Should I not worry about cutting back the extension and just use a chisel or punch to break it free from the pipe...(without hammering on the pipe).
At least one thing works in my favor... the wall connection is directly accessible..
Thanks in advance for your help.
Pete
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Peter wrote:

Since you can't budge it, it may be soldered into a brass ferrule or trap adapter.
I would just saw the chrome piece off *outside* the wall and use a "repair trap" or a 1 1/4" slip coupling.
I can't see from here what it looks like, but you can get in trouble fixing whatever is in the wall.
Jim
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Thanks Jim... I got it out.
I used some auto gasket remover (spray) to loosen up the plumbers putty, followed by a good dose of PB Blaster (nice stuff to keep handy).
One problem was the pipe wrench (with good teeth) couldn't grab the surface to apply sufficient force to turn it. Figured I would destory the extension anyway so went for the curved end and got it to budge. The rest was easy. Punched the tube in with a chisel and twisted right out. Cleaned pipe and inserted the new one. Didn't bother using plumbers putty this time as the fit was pretty tight. I can apply it later if necessary.
The replacement extension and pipe was so darn THIN it flexed when twisting it back into the pipe. Plus the original p-trap had a cleanout plug. The replacement didn't... both came from home depot who no longer carries the cleanout plug replacement. bummer.
Jim... thanks for your help... I'll keep the information handy as there will be other traps to replace.
Peter
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extension pipe with a pipe wrench, big pair of pliers, or even a big c-clamp.
Don Young
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That's another great idea which would have worked perfectly. Thanks for sharing it Don !!
Peter
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