Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HP8553 found under Parts Kit Linear Di by Tactair Fluid Controls Inc. The National Stock Number assigned to this part is 1650009069359, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HP8553.