Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 604-1IN found under Adapter Straight Pi by Northern Indiana Business Services. The National Stock Number assigned to this part is 4730007223565, 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 604-1IN.