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My dad just installed a new Korky toilet flapper on his Toto toilet, as he said the old one was not sealing properly and he could hear water running all the time. The new Korky flapper was installed easily, with about an inch of slack in the chain, and connected to the hole at the end of the flush rod. When the toilet is flushed though, the flapper opens up fine, but then closes right away without allowing most of the water to drain into the toilet and giving a good flush. I've tried changing the length of chain and tried different holes but still no joy. Any ideas? Thanks
 

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inch of slack is too much. It won't lift the flapper long enough to get a good flush. Shorten slack to 1/8 of inch see what happens.
 

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Did you read the instructions. Most of the ones I use have a adjustment and set to the setting for that model Toto or other brands.
I usually just adjust it for all brands to the setting to stay open longer. anyway.
 

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You could determine if its chain length or a flapper/toilet combo issue by flushing manually. Disconnect the chain from the flush lever and pull the chain up up manually. Make sure the flapper comes all the way up before it begins the decent.

If it just keeps closing too quick, there are small foam floats that can be connected on the chain to slow down the flapper decent which will allow more water into the toilet bowl.
 
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