I join the club of non closing black valve since about 2 mo after i bought it, figured their was a piece of tissue jammed in the valve, I use mass water when flushing,chemicals, Tank flushing, EVERYTHING now I at least got it to close ALMOST all the way where it will hold water for the most part ,do not feel like taking on that project so I just put a extra valve on the end of the pipe....Good Enough
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