Greetings,

Make sure the lip that the flapper seals against is smooth and clean.

Hope this helps,
William

PS: The 99c ones have always served me well.

"bumtracks" wrote in message
news:Poiyd.3983$tG3.2018@trnddc02...
toilet tank flapper isn't sealing quite perfectly
on occasion hear the tank topping up.
Thing in there now is attached with ears over tabs on the tube and looks
like pressed carped padding - butt ugly!

Any good/better/best stopper floppers out there ? options ?