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In the case where the flapper closes too quickly, get one that has more buoyancy, such as the Hornet V (buy online) or a universal one by Korky (at Home Depot, Lowe's, etc.). These two tend to float on top of the water as it drains downward. Avoid flappers that have a small round hole in the front of the flapper cone, as the hole reduces buoyancy.
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