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