Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9T2171 found under Seat Valve by Caterpillar Inc. The National Stock Number assigned to this part is 4820014813984, 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 9T2171.