Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4U4059 found under Cylinder Assembly A by Tactair Fluid Controls Inc. The National Stock Number assigned to this part is 1650015987365, 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 4U4059.