Replace Mansfield toilet flush valve gasket seal and flush handle

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The Mansfield flush valve gasket seal is replaced by:

  1. Turn off the water supply and flush the toilet.
  2. Unscrew the top cap and remove from guide.
  3. Reach into the tank and remove old gasket.
  4. Replace new gasket IN THE GROOVE.
  5. Drop the canister back on the guide post and screw on the cap.

6. Insert the flush handle, restore the water and test.