Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS720-4 found under Hose Assembly Metal by F M H Corporation. The National Stock Number assigned to this part is 4720008745978, 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 HS720-4.