Be careful with the Rolo-Flair. Mine was leaving score marks in the tubing, right out the box, brand new. Only a couple minutes of filing to remove the burr on the die but for what they charge I would have expected better quality control. Otherwise it works fine.Use your normal flairing tool like this:
Rolo-Flair Flaring Tool 37° | Aircraft Spruce
Rolo-Flair Flaring Tool 37° Operates on same principle as Imperial #507-FA but flares 1/8www.aircraftspruce.com
View attachment 65620