Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21-10518 ITEM 5 found under Hose Assembly Nonmetallic by Mac Gregor Usa Inc. The National Stock Number assigned to this part is 4720014289760, 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 21-10518 ITEM 5.