Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ML4378-1R found under Pump Unit Centrifugal by Marshall Engineered Products Co. The National Stock Number assigned to this part is 4320003413576, 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 ML4378-1R.