Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TSP-3301-S found under Valve Linear Directional Control by Versa Products Co Inc. The National Stock Number assigned to this part is 4820012938577, 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 TSP-3301-S.