Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 54000821000 found under Adapter Straight Pi by Mechanical Equipment Company Inc. The National Stock Number assigned to this part is 4730013711782, 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 54000821000.