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I'm looking for guidance on either how to clean this or replace it. I'm redoing our master bath and this looks hideous.

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Are you able to pull the copper up at all? If so, pull it up, clamp it low so it doesn't slide back down into the floor, cut it off just below that solder drool we see, clean it up and either solder on a new stop valve or use a compression stop valve. Don't forget your eschuteon!

How much up and down movement can you get. This is not hard to fix up and a new stop will only cost about $7. I'd replace it with a 1/4 turn stop. Back to you

are you able to pull the copper up at all? If so, pull it up, clamp it low so it doesnt slide back down into the floor, cut it off just below that solder drool we see, clean it up and either solder on a new stop valve or use a compression stop valve. Dont forget your eschuteon!

The pipe isn't able to be moved at all. I'm half tempted to remove that area of the subfloor so I can get down underneath a bit.

Ah, soldering that close or closer isn't a problem with the right tools. I have a nice cloth-like barrier I use. They claim, the more you use it, the more protective it gets. A lot of times I use a piece of metal under it which I would in this case. The ones I've seen in a hardware store are crap.

I got it at SmallParts.com: The Hardware Store for Researchers and Developers (http://www.smallparts.com). I'd have to find it there for you.

For a pretty way to do this, I solder a female adapter and use a length of chrome plated brass pipe. I hide the adapter under the bell estucheon. Then use a threaded angle stop.

How much height will be added when you install your new floor? A compression stop is a consideration but most escutcheons won't slip over them so solder is still your best approach.

Rather then solder with the flame so close to your wooden subfloor why not cut the hole larger, cut the copper back and install a Sharkbite Coupling. Now you can extend the raiser up to the desired height without fear of starting a fire. Good luck, Tom

It looks like there's a threaded adaptor on the copper pipe, I would just sweat the old fitting off the end of the copper pipe and clean up the section of copper that's there, sweat and extend that piece of copper up another six inches or so with a copper coupling and a new straight stop. Goodluck ----zeke----