If you carry a full size flashlight, like the Streamlight 20X LED,
the cap alone will not break glass. There is no way
you can break a window with these flashlights without causing damage to
your expensive light or injuring someone from flying glass. Attaching
Bust A Cap® to your flashlight will insure that it will break glass
with just one tap and not damage your equipment.
remove the o-rings from the old cap and put on your new Bust a cap to
insure that your light remains water tight.