Kohler K-4000 Installation And Care Manual page 4

Bridge
Bracket Marks
2. Install and Connect the Module
NOTE: If the toilet tank does not have vent holes, discard the
bridge.
NOTE: The orientation of the bracket location marks to the vent or
other tank features will vary on different models of toilets.
If a vent is present, install the bridge over the vent if the vent is
aligned with the bracket marks.
Install the module with the bracket aligned with the bracket
marks.
Connect the chain from the canister to the wheel.
1224637-2-D 4 Kohler Co.