Valves are positioned at intervals along the aqueduct to enable water flow to be stopped in case of bursts.They are also very useful to gate spotters as they are a give away of the aqueducts exact position

Brighouse - Yorkshire

Grid ref : SD509972

So called Wells were constructed in the form of squat stone buildings
	Grid ref ; SD512968
North Wells - built where cut and cover or tunnel changed to pipeline - in the event of a burst valves could be closed to allow repairs South Wells - built where a pipeline changes to cut and cover - in the event of a burst valves could be closed to allow repairs