DIY Network

How to Use Flare Fittings

To create a stronger connection than soldered or compression fittings can achieve, use a flare fitting. Master plumber Ed Del Grande demonstrates the process.

More in Plumbing

  • Time

    1 hour

  • Price Range

    $1 - $50

  • Difficulty

    Moderate to Hard


Step 1: Remove any Burrs

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.

Step 2: Make the Flare

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.)

clip pipe in flaring tool

Step 3: Make the Connection

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.

make pipe connections as tight as possible