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The first step is to cut out a section of the cold water line to insert the mixing valve. Cut out a small section of both the cold and the hot water lines using a pipe cutter (Image 1).
Note: have a bucket ready to collect any water that is left in the pipes (Image 2).
Install the T fitting on the hot water pipe.
Use the torch and flux to solder it onto the existing hot water line.
Note: Take off the drain before soldering so the heat doesn't melt the rubber gasket. After soldering, replace the drain.