Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RB20-208 found under Coupling Half Shaft by Penn Yan Boats Inc. The National Stock Number assigned to this part is 3010003773373, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RB20-208.