Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F0R11-20DTUBES found under Head Vibrator Tube by Thomas C Wilson Inc. The National Stock Number assigned to this part is 4940003914521, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like F0R11-20DTUBES.