Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W2.1K-34-M5 72449 72450 found under Pump Rotary by Borneman Pumps Inc. The National Stock Number assigned to this part is 4320014725870, 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 W2.1K-34-M5 72449 72450.