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Tub spout copper pipe too long.
Well you have a choice.
I made a big mistake by cutting the 1 2 copper nub coming out of the wall to less than the minimum called for.
Cut a piece out of the copper pipe 1 long.
Then measure the distance from the surface of the wall to the back of the threaded elbow inside the wall.
For slip on tub spouts your copper pipe should be a minimum 1 and a maximum 2 7 8 in length depending on the tub spout.
That means with the tile you can no longer reach the threads in the spout.
In my opinion i would have replaced the whole faucet.
The faster just as appropriate but may not look that good repair is to apply enough caulking into the gap so that it can be smoothed flush with the spout.
Solder on a new adapter.
Smsplumbing md the pipe looks to be soldered but your spout is still on so its hard to see the side that is in the spout.
If it is copper inside the spout cut the male adapter off and buy the slip on spout.
Refer to the manufacturer s specifications prior to purchasing and installing to ensure you have the appropriate length for your spout.
Replace with a shorter nipple equal to the gap measurement.
Tub spout nipple too long after remodel.
First figure how short you are let s say you re 3 8 shy of making a connection.
Need help with bathtub spout replacement nub is too short.
Reduce that measurement by 1 5 inches and cut the pipe there.
To use the threaded adapter measure from the shoulder of the existing adapter to the wall.
Total the two and add 1 4 inch.
Everything else is new.
You can cut the pipe and solder on another male threaded adapter or you can cut the pipe and use the slip fit adapter.
Use teflon tape on all male pipe threads and caulking behind the spout base.
Measure the length of your tub spout from the back edge of the spout to the front where the threads start on the inside of the spout.
You need to un screw the spout and the pipe nipple.