Kohler Prim R706534-8L-SHP Guide D'installation page 13

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10. Install the Wall Brackets
Thoroughly clean the wall and shower area before proceeding.
Secure each bracket to the wall using two #8-18 x 1-1/2" screws.
Verify that the bracket is level. Loosen the screws and adjust the bracket position if needed.
Repeat for the second bracket.
Kohler Co. 13 1380408-2-B