Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 91-4002 found under Socket by Parker Hannifin Ltd. The National Stock Number assigned to this part is 4620016425723, and the Federal Supply Class is 4620 Water Distillation Equipment Marine And Industrial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 91-4002.