whereby, the position of said lower stop on said {HEAD ~ front side} of {TAIL ~ said valve housing} is adjusted so as to control rotation of said flap inside said hollow space, thereby adjusting the water flow through said clearance when said toilet bowl is refilled 
whereby , the position of said lower stop on said { HEAD ~ front side } of { TAIL ~ said valve housing } is adjusted so as to control rotation of said flap inside said hollow space , thereby adjusting the water flow through said clearance when said toilet bowl is refilled
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