Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1678 found under Valve Linear Directional Control by S And S Truck Parts Inc. The National Stock Number assigned to this part is 4820008517674, 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 S1678.