Collet Covers and Collet Clips Collet covers for use with standard Speedfit fittings, are available in white or in red or blue to allow colour coding of pipes. White or grey collet clips are used with standard fittings to prevent accidental pipe disconnection. Red or Blue collet clips provide colour coding of pipe on Twist and Lock fittings. They are not designed to prevent accidental release and should be fitted when the fitting is in the locked position. Product Application Information Collet covers or collet clips can be used to provide added security against pipe disconnection.