Adaptall 24º tube fittings, or 'Bite-Type', are the most popular fitting globally and employ the most advanced tube fitting system in the world. This system is capable of withstanding high pressures and extreme vibration, thanks to the cutting ring design. The cutting ring is a ferrule that incorporates sharp cutting edges. When a nut is torqued onto the fitting, the base of the nut comes into contact with the cutting ring, wedging it into the 24º tapered throat of the fitting thereby cutting into and gripping the tube.