Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RB-3-50-GR-874 found under Coupler Indicator by Cobham Electronic Systems Inc. The National Stock Number assigned to this part is 6625001843446, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RB-3-50-GR-874.