A Mechanism for Filling a Toilet's Water Tank

This page is the CodyCross answer for the clue below from Paris, Group 244, Puzzle 5 (Fondation Louis Vuitton).

Question is: A Mechanism for Filling a Toilet's Water Tank

and the answer is: BALLCOCK

Word Meaning:

BALLCOCK — A floating sphere, attached to a lever, that controls the level of liquid in a cistern.

Definitions from Wiktionary.