Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 564A4 found under Nut Tappet Valve by Diamond Reo Truck Co. The National Stock Number assigned to this part is 5310003828644, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 564A4.