Kohler VEIL K-5402A-0 Installation Instructions Manual page 22

Adjust water tank flush volumes as shown:
Full Flush: 1. Open adjustment switch
2. Open small hole
Half Flush: 1. Adjust float box position
(water level should be on the bottom of float box)
Adjusting the control pole will cause the water level to
change within the water tank.
Turn the pole clockwise to increase the water level and
anti-clockwise to reduce it.
1266554-A02-A 22 Kohler Co. March 2016