Toto Fill Valve Leak

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ncg45

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I have slight leak at the plastic nut that fastens the fill valve at the bottom of the tank. See water drop in photo. I replaced the rubber washer that goes on the threaded inlet tube but that didn't seem to help. I've tightened the plastic nut, but I don't want to over tighten. I see no cracks in the tank by the inlet hole. Any ideas on what to try next?

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Terry

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How old is the fill valve? I've had older ones develop leaks in the plastic. Nothing I could do there except replace it.
If it's fairly new, then perhaps checking the inside of the tank for smoothness. I sometimes sand if needed. Pretty rare, but sometimes it helps.
 
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