Shut off the main water supply to the house the locate a 3/4-inch water line in the garage or basement. Cut out a 1-inch section with a pipe cutter and allow excess water to drain. Solder in a 3/4-inch "T" section.
Solder a 2-inch length into the "T" outlet. Solder a 3/4-inch copper adapter to the other end. Screw a 3/4-inch PVC female slip adapter on to the copper pipe and tighten.
Cut a short length of 3/4-inch PVC pipe. Glue one end to the adapter with PVC cement. Glue a 3/4-inch shut-off valve to the other end.
Shut the valve, turn on the water and check for leaks.
Chris Deziel is a contractor, builder and general fix-it pro who has been active in the construction trades for 40 years. He has degrees in science and humanities and years of teaching experience. An avid craftsman and musician, Deziel began writing on home improvement topics in 2010. He worked as an expert consultant with eHow Now and Pro Referral -- a Home Depot site. A DIYer by nature, Deziel regularly shares tips and tricks for a better home and garden at Hunker.com.