I need to replace a flexible connector on my son's toilet. A plumber (or so they claimed to be) removed a section of leaking copper pipe and replaced it with a poorly fitted flexible hose. The cistern is filling really slowly and it's because of a kink in the pipe. See photo. I've got approximate measurements and I'm looking for confirmation of the size of hose I need. I'm assuming 15mm compression x ¾ inch x 200mm.

