O.S. Engines Back Plate Gasket

O.S. Engines Back Plate Gasket
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This is a replacement O.S. Engines Backplate Cover Gasket, and is intended for use with the O.S. 91HZ F3C and 91HZ-PS 3D Helicopter Engines, as well as the O.S. FS200S-P, FS200S, and FS110-a four stroke engines.