Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3431-028 found under Insert Engine Valve by Woodward Governor Company. The National Stock Number assigned to this part is 2810013734115, and the Federal Supply Class is 2810 Gasoline Reciprocating Engines Aircraft Prime Mover And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3431-028.