[Reworking]

Ho w can I extend a copper pipe to fasten a faucet without trearing out a wall in a bathroom? The pipe is 1/2" & the faucet will merely slip on & will be held by a set screw.

 

[Just Bill]

I assume you are talking about a tub spout??? If yes, there are spouts that have the connection close to the wall for short stub issues, look for one of those. Often, the tub stub screws into a fitting in the wall, if that is what you have, the old stub can be unscrewed and a new one made up and installed.

 

[AllanJ]

A set screw does not hold a faucet on a pipe without having a leak.

The faucet must screw on or be soldered on. A set screw arrangement probably means some kind of fitting or adapter must be screwed or soldered on first. If less than 1/2 inch of pipe protrudes from the wall and that piece does not unscrew from an elbow behind, then you will need to break open the wall where the pipe emerges.