Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1610B found under Stem Fluid Valve by Dresser Rand Co. The National Stock Number assigned to this part is 4820001455020, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1610B.