Remodeling our bathroom and need to switch out the shower valve. The walls are open, so everything is accessible. If it's harder than this, or I'm missing something, please let me know...
All outside the wall...
1 - disassemble the guts of the valve so as to not damage it with heat
2 - with proper measurements of course, fit two short pipes coming out left & right with the proper threaded fittings
3 - sweat the 90 degree elbows on each side to bend down towards the supplies
4 - sweat a short extender pipe down from each elbow (vertically)
5 - sweat a coupling on the bottom of each cold/hot pipe to attach to the cold/hot supplies
6 - on the top of the valve, sweat/thread the supply that goes up to the shower head
7 - reassemble the valve
Now... working in the wall...
1 - cut the water supply off (at the main, because I don't have a shutoff valve at the shower)
2 - cut the cold/hot supply lines, using my pre-assembled vavle/elbow assembly to measure where
3 - sweat the assembly at the cold/hot coupling to the cold/hot supply coming out of the floor.
4 - let the solder cool
5 - turn the water on.