Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1INCH4P2502B found under Meter Fluid Flow Indicating Diff by Erdco Engineering Corporation. The National Stock Number assigned to this part is 6680000366298, 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 1INCH4P2502B.