Reduce that measurement by 1 5 inches and cut the pipe there.
Tub spout copper pipe too long.
Replace with a shorter nipple equal to the gap measurement.
Total the two and add 1 4 inch.
You need to un screw the spout and the pipe nipple.
Well you have a choice.
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.
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.
In my opinion i would have replaced the whole faucet.
The result is the overall length of the pipe you need.
I made a big mistake by cutting the 1 2 copper nub coming out of the wall to less than the minimum called for.
Then measure the distance from the surface of the wall to the back of the threaded elbow inside the wall.
You can cut the pipe and solder on another male threaded adapter or you can cut the pipe and use the slip fit adapter.
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.
First figure how short you are let s say you re 3 8 shy of making a connection.
Solder on a new adapter.
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.
Idreos md i replaced a bath tub spout with a danco spout made to replace the old moen spout.
Refer to the manufacturer s specifications prior to purchasing and installing to ensure you have the appropriate length for your spout.
Everything else is new.
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To use the threaded adapter measure from the shoulder of the existing adapter to the wall.
Need help with bathtub spout replacement nub is too short.
Use teflon tape on all male pipe threads and caulking behind the spout base.
That means with the tile you can no longer reach the threads in the spout.