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The reason a flaring tool exists is to cut a piece of soft copper tubing, apply a flare fitting, and provide a waterproof seal without soldering. It is often preferred to use flared copper pipe when water or gas will be going through the tube.
Steps in Flaring. 7.3.1 Tube Cutting. For an even flare it is recommended that a tube cutter be used in lieu of a hacksaw. The copper tubing should be cut off squarely. When the tube cutter tool is used correctly, there will be very little burr left on the inside of the tube. Cutting the tube too fast produces a larger burr on the inside of the tubing.