Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9Y-4242 found under Diffuser Air Turbos by Caterpillar Inc. The National Stock Number assigned to this part is 2950014223013, and the Federal Supply Class is 2950 Turbosupercharger And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9Y-4242.