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Rotary Corp brand aftermarket product. Trimmer gear box head Replaces 4137 640 0100. Complete unit with gears.Replaces Replaces models: FR130, FR220, FR350, FR450, FR480, FS36, FS40, FS44, FS80, FS75, FS83, FS85, FS90, FS100.

Rotary Corp brand aftermarket product. Universal Trimmer Gear Box Kit for use with most brands and models of Brush Cutters & String Trimmers. Fits trimmers from 20cc to 40cc. Has 10mm x 1.25 LHM arbor for trimmer head mounting, Fits same as used by Echo...