Gwent Police is appealing for information after the Hollybush Allotments, in Llwyncelyn Terrace, Nelson were broken into.
The break-in is thought to have happened between 8pm on Friday July 29 and 7am on Saturday July 30.
Copper and brass tap fittings and piping were stolen.
Anyone with information about the incident is asked to contact Gwent Police on 101 or Crimestoppers anonymously on 0800 555 111.