Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 55DHD19 found under Tee Tube by Precision Form Rivet Inc. The National Stock Number assigned to this part is 4730004509138, 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 55DHD19.