Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TYPE304-1IN found under Nipple Pipe by Ducommun Metals Co. The National Stock Number assigned to this part is 4730009288948, 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 TYPE304-1IN.