Have a 3" copper Drain/waste/vent in my bathroom wall- I am relocating the vanity to the other end of the bathroom.

All I need to do is literally turn the existing fittings 180 deg to face the other
direction and I would be set - is this feasible with just a propane torch or should I just cut it out and replace with PVC & couplings?

I am thinking it would be simpler to replace with PVC than trying to mess with the copper & I have to transition to PVC anyway.

Opinions? I'd post a pic if I were allowed ...

 

I used these fittings called sharkbite. They really worked for what I needed to do. I got them at home depot.

SharkBite Couplings SharkBitePlumbing.com

 

I doubt they make 3" sharkbite fittings. A propane torch would work and I would re-flux and apply one the fittings are rotated.

 

I always find it hard to get copper "shiny" after unsweating fittings.

Especially If you can't see the backside, in your case the pipes are not under pressure, but I still would hate to see a leak.

Are just moving the cabinet down the same wall?

If it were all PVC piping, common practice would be to install a new T anyway. This would save time.
Adjusting the T may aid in fall too.

Pictures would be nice.

 

Why not just cut the pipe, turn the pipe with the fittings the 180 degrees, and then use a rubber compression coupler?
No fuss, no mess. and a whole lot cheaper aswell as easier than trying to find a copper coupler and then having to sweat it together.

 

Copper for waste? Code or something? Iron was always the way to go until ABS showed up. Working ABS is the same as PVC, just different glue.

 

When I started in the trades there were towns here that called for copper waste. There was even one that would only allow pressure rated copper (no DWV)

Copper is smaller in diameter than iron or plastic and 3" fittings will fit in a 2x4 wall.
It is much noisier than cast iron.

It takes a lot of torch to sweat 3 & 4" fittings.
If I were you I would adapt to plastic and glue from there.

JM2c

 

My folks have a lot of copper drainpipe in their house. (Built in '66.)
I thought that was strange. Very strange. They also have cast iron.

When I replaced their cracked concrete laundry tubs (switched to plastic), I used a MAPP gas torch to loosen and turn their copper drainpipe, so that it would line up with the trap.
It took a LOT of MAPP gas!!!!

They hired a plumber to put in a 'stand pipe' for their washing machine, several years later, and he used a rubber coupler (with stainless clamps) above and below a new PVC "T" and PVC pipe for the new drain.
He cut out a section of this copper pipe to put this new stuff in.

Zero leaks in over 10 years.

 

Thanks for all the responses guys...

I think i will be going with the PVC & couplers -