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Made by Venhill.
DUO stands for 2 postions of the throttle tube with follwoing effect:
Motocross (fast) setting: 36mm take up in 68 deg. of rotation.
Enduro (medium) setting: 36mm take up in 80 deg. of rotation.
This throttle replaces Magura 312 / 314 en Venhill 500A