Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 76643-45X1PC11 found under Spacer Flexible Pipeline by Electric Boat Corporation. The National Stock Number assigned to this part is 4730008682979, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 76643-45X1PC11.