Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 055-0002R020 found under Tube Metallic by Williams Fire And Hazard Control Inc. The National Stock Number assigned to this part is 4710015955114, 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 055-0002R020.