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During the shower valve rough-in, install a pipe nipple (usually 1/2" male for most supply elbows) at the location desired. Position it so it sticks out past the position of the finish wall by about 1/4". The engagement of of 1/2" pipe thread is about 1/3" so you don't want the nipple sticking out farther than this or the escutcheon won't cover up properly. Wrap the nipple threads with Teflon thread tape.
Complete the shower installation and finish wall.
Check that there is no dust or gunk on the taped threads of the nipple. Turn the elbow onto the nipple by hand.
Final tightening is tricky. Unlike a rough-in connection where you have wrench flats on both threaded pieces, here you have no wrench flats on the elbow and no access to the wrench flats on the nipple. A key consideration is whether or not your main shower flow valve blocks the supply pressure on the elbow when it is closed. If not, the elbow thread seal will have to support the full supply pressure, but if so then the thread seal has to support only a very low pressure.
To tighten the elbow without damaging it, you can use a strap wrench, or a wrench with some rags and padding to protect the finish of the elbow, or you can use a screwdriver in the outlet of the elbow. None of these is an ideal way to get enough torque to seal the full supply pressure if that's necessary.
In the case that the full supply pressure must be supported by the elbow thread seal, then the part I still don't know is whether you need to find a way to support the nipple to avoid torquing the pipe inside the wall too much. Nothing I have found online addresses this concern. Presumably, the elbow supply pipe inside the wall should be firmly supported with some bracing or something during the rough-in part to address this concern but I have no idea.
When finished, check for leaks. Again, this is not as easy as with a rough-in connection, since you are now restricted to a very small hole in the finish wall. Stuff some paper towel in there underneath the pipe nipple, wait for a few minutes or hours, and check for any water drops on the towel.
This seemingly simple option on my shower kit turned out to be the trickiest part to install.
What else can I help you with?
How do you install plumbing for a shower with body sprays?
convert plumbing to cpvc. install cpvc elbow in wall with 1/2 inch tubing place in elbow but not glued. finish wall tileing then cut pipe to fit body spray so it is firmly against tile surface. remove, glue and press into elbow.
How to install a wall mounted toilet?
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How do you install a wall mounted sink?
To install a wall-mounted sink, first locate the studs in the wall and mark where the sink will be placed. Install a support bracket to hold the sink in place. Connect the water supply lines and drain pipe to the sink. Secure the sink to the wall using screws or brackets. Finally, seal around the edges of the sink with caulk to prevent leaks.
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How do I properly install a pedestal sink in my bathroom?
To properly install a pedestal sink in your bathroom, first turn off the water supply and remove the old sink. Install the sink bracket on the wall, making sure it is level. Place the pedestal on the floor and attach it to the sink. Connect the faucet and drain pipes, then secure the sink to the wall bracket. Finally, turn on the water supply and check for any leaks.
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How to install a wall mounted sink in a bathroom?
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