Device Found in Toilet Cisterns and Water Tanks
This page is the CodyCross answer for the clue below from Making a Documentary, Group 1512, Puzzle 4 (Travel and Cuisine).
Question is: Device Found in Toilet Cisterns and Water Tanks
and the answer is: BALLVALVE
Word Meaning:
BALL VALVE — A contrivance by which a ball, placed in a circular cup with a hole in its bottom, operates as a valve.
Definitions from Wiktionary.