- Shut the main.
- Remove the rusty strap.
- Cut the copper pipe a few inches to the right of the rusty area and a few inches to the left. Clean/sand/flux the edges on the old pipe.
- Get 2 couplings (one with stop and one without stop). Clean/sand/flux them.
- Get a piece of pipe with the same diameter as the old pipe, and cut to the right size. Clean/sand/flux the edges.
- Solder the coupling with stop to one end of the piece of copper pipe, and wipe off the excess. Make sure you have a spray water bottle with you, just in case.
- Slip the coupling without stop on the other end, all the way.
- Place the new pipe in line with the old pipe and insert the one end with the coupling with stop into the old pipe.
- Align the other end and slip the coupling without stop about half the length of the coupling, over the edge of the old pipe.
- Solder and wipe clean.
- Attach a new strap to support the pipe - I like to use copper strap.