Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 56.00.428 found under Bushing Care Hose by Gill Group Inc. The National Stock Number assigned to this part is 4720015825893, 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 56.00.428.