Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4W 1877 found under Hose Assy by Caterpillar Inc. The National Stock Number assigned to this part is 4720014858651, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4W 1877.