Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R19858 found under Ring Piston by Emerson Power Transmission Corpo. The National Stock Number assigned to this part is 2825002719025, and the Federal Supply Class is 2825 Steam Turbines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R19858.