To add an AC outlet, for example, you just drill a circular hole in the wall, tap into the wiring, add the outlet and you're set. If you don't want it, pull it out and plaster over it with more earth to seal the hole.
-- Randy Bachman
   
Randy Bachman   Name:
Randy Bachman
Type:
Musician
Nationality:
Canadian
Birth:
September 27, 1943
https://www.nutquote.com/quote/Randy_Bachman