Separating brass-rubber-copper fitting from 1969

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DJ...

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Happy Holidays!

Reaching out for some fresh ideas on how to dismantle an in-wall shower fitting from 1969. Both sides of the upstairs wall have tile so I've been performing this work overhead via basement access which complicates options.

The fitting began leaking and it appears the issue is with the rubber in the compression fitting so I am trying to remove everything up to the valve body so I can replace it (CPVC?).

Heres the stack (top to bottom):
1) Brass valve body (compression nut has been removed)
2) Rubber grommet (stuck)
3) Copper FPT (stuck)
4) Copper MPT to 1/2" copper pipe (has been removed)

This has been sprayed with PB many times over weeks and had heat used multiple times to unbind the copper pipe MPT to FPT.
I then removed the brass fitting compression nut revealing the rubber grommet between parts.

Now I am left with this and it does NOT seem to want to budge when I pull on it.
Any ideas how I can most easily and effectively fix a leak in this 55 year old rubber boot?

Attached Photos:
"brass-rubber-copper" shows the remaining in-wall pieces from a side view via scope (#1, #2 and #3)
"Screenshot" shows the removed pieces (nut from #1 and #4)
 

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Reach4

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What is the relationship between Screenshot and the two brass-rubber-copper pictures?
 

DJ...

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The "Screenshot" shows the removed pieces
The "brass-rubber-copper" images shows what is remaining in-wall with a side view via scope
 

GReynolds929

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What does the copper male thread into, the nut shown looks like part of a union, the other pics look like the other half of the union and rubber washer. If that's a union parts are missing.
 

DJ...

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Hi @GReynolds929, thanks for asking!
The copper male threads into the female copper.
The brass nut screws onto the brass fitting
The union is composed as follows: (top to bottom)
1) Brass valve body (nut has been removed)
2) Rubber grommet (stuck)
3) Copper FPT (stuck)
4) Copper MPT to 1/2" copper pipe (has been removed)
 

GReynolds929

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OK the copper female is the back half of the valve that the rubber washer seats between it and the valve body. It should have a flange that the removed nut uses to compress the washer when tightened. The only thing holding it on the valve is the washer. As you've discovered it is stuck together, it should pull apart with enough force. Hopefully you can get a replacement when it comes apart cause the rubber will not be reusable.
 

DJ...

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Success! I was able to remove the remaining old part stuck into the valve body. There wasn't any rubber, just a FPT to compression adapter that was cracked. Ferguson referred me to an old hardware store (Five Points Hardware) that had this replacement part. I used a wire brush on drill extension to clean the seat, installed the new part dry, cinched tightly, and installed new CPVC piping for the win. No drips!

Thank you everyone that reviewed and commented. Hoping this helps someone else in an old house avoid having to tear open walls.
 

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