Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R40-44 found under Pump Reciprocating by Grover Smith Mfg Corp. The National Stock Number assigned to this part is 4320012851480, and the Federal Supply Class is 4320 Power And Hand Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R40-44.