A gas bottle and a Eldis Leisure conversion battery were stolen from a motorhome parked outside a house in Brynglas, Penyrheol.
Gwent Police is appealing for information about the theft which happened between 1.30am and 2am on Friday December 12.
Anyone with information can call Gwent Police on 101 or Crimestoppers anonymously on 0800 555 111 quoting log 92 02/01/15.