Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6655221 found under Pipe Assembly Metal by Melroe Co. The National Stock Number assigned to this part is 4710015869833, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6655221.