Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7D4027 found under Adapter Filler Neck by Caterpillar Inc. The National Stock Number assigned to this part is 2990015150120, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 7D4027.