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To install a flare fitting, first remove any burrs from the pipe ends, then slide the flare nut onto the pipe. Push it back far enough so that it will be out of the way when you use the flaring tool.
Clip the pipe in the flaring tool, keeping the end flush with the face of the tool.
Slowly turn the handle on the tool until it bottoms out.
Unscrew the handle and remove the tool to check the quality of the flare. (If the flare isn't smooth or even the first time, cut off the end with your pipe cutter, and try the technique again.)
Line up and tighten the nut and flared pipe to the fitting body. Make the connection as tight as you can.
Tip: Solid brass compression and flare fittings may cost ten times as much as copper fittings -- and take twice as long to install. Use them where the most durable connections are required.