A small block of sulfur-free rubber that is inserted into the end of a device packaging tube (tube) to
prevent the flow of devices from the tube. The different steps of the packaging, shipping & testing process
use specifically colored plugs as a visual indicator of the state of the devices therein.
NOTE: The color of the plug is only a visual indicator and does not guarantee the state of the
devices. Other factors such as tube color and accompanying documentation should be used to
make this determination.