Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C903-2A found under Meter Fluid Flow Indicating Diff by Philpot R D Industries Instrument. The National Stock Number assigned to this part is 6680004458641, 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 C903-2A.