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Athearn F unit Connection Kit (gray). For Athearn Blue Box locomotives. Comes with #6100 close coupling draft gear boxes and diaphragms for the rear of two A Units or one B unit.
This easy to assemble kit turns a diesel lashup into convincing scale power units. Diaphragms stay connected in turn radii over 24 inches and have no minimum radius for smooth operation. Use with Kadee #5 or similar Couplers.