DEC VT420 Service Manual page 49

2. Seal up the container so that only the very tip of the CRT neck is
exposed.
3. Using the specified pliers, slowly crush, but do not snap, the
evacuation point. Do not move or disturb the CRT until the hissing
sound of inrushing air has stopped.
NOTE
The evacuation point is a protrusion that extends from
the circular area defined by the CRT neck pins. The glass
protrusion is sometimes encased in a protective plastic cap,
and more force is required to crush it.
4. Seal the carton with packing tape and dispose of it in the Digital site's
trash compactor or receptacle.
NOTE
This safe gassing of the CRT is necessary to prevent liability and
safety problems that may arise from accidental CRT implosion.
Removing and Replacing FRUs 41