Flushing's high-water control (4,4)

I believe the answer is:

ball cock

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'control' is the definition.
(ball cock is a kind of control)

I can't explain the remainder of the clue.

(Other definitions for ball cock that I've seen before include "Device controlling inflow into a cistern" , "Device controlling flow into cistern" , "Component of cistern" , "Device controlling flow of water into tank" , "Cistern valve mechanism" .)

I've seen this clue in The Globe and Mail.

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