Kohler K-527 Guide De Propriétaire page 29

Check Valve
Copper
Tube
Nut
Seal
Clean the Inlet Screens
Disconnect the power and turn off the water supply.
Unthread the plastic nuts from the hot and cold inlets.
Remove the copper tubes. The O-ring and screen may be attached
to the end of the tube.
If the screen remains in the check valve, use a small flat-blade
screwdriver to gently pull the check valve from the valve inlets.
Remove the screens from the copper tubes or check valves.
Clean the screens to remove any dirt or debris.
Rinse or replace the check valves and screens.
Reassemble the inlet connections.
Kohler Co.
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Screen
O-Ring
29 1214635-5-A