Soldering Copper Pipe with Ball Valves Video
If your remodeling job requires that a water pipe be shut off or relocated, don't just cap it off. Solder a ball valve into the line. This will allow you shut the water off and reconnect the sink easily without having to shut off all the water. You will have to remove a short section of the copper pipe to make room for the valve. This is normally about 1-1/4".
Cut the pipe, clean both ends and the inside of the fitting, flux it and solder it in place. Then you will be ready to keep moving forward on the kitchen remodeling project.
Once the pipe is cool to touch, take a rag or a paper towel and wipe the area soldered to get all the flux off. If you don't, the flux will corrode the copper pipe over time and cause a leak.
Tim built custom homes and did ultra-custom remodeling for 20+ years before launching his Ask the Builder media presence. He was selected as one of the Big 50 by Remodeling magazine in 1993. This award gave birth to Ask the Builder in October 1993. Tim also operates https://DrawPlumbingPlans.com. His @askthebuilder YouTube channel was the first home improvement channel on YouTube.