Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TT370N2B3 found under Knob by Dupree Inc. The National Stock Number assigned to this part is 5355011505981, and the Federal Supply Class is 5355 Knobs And Pointers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like TT370N2B3.