Zefon Inner wall attachments are used in conjuntion with Air-O-Cell cassettes to access mold contamination in a wall cavity.  Starter Kit comes with rod to release end caps.

Care should always be taken to be sure you:

Have your ESA Intrusive Agreement signed before drilling into the wall
Make sure your are not drilling to lead painted walls
Be sure there are no plumbing or electric issues behind wall
Drill at bottom of wall, just above baseboard
Clean up carefully all dust and debris after closing the hole in the wall