Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FIT 221 3 8 found under Tubing Nonmetallic by Alpha Wire Corporation. The National Stock Number assigned to this part is 4720012473213, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FIT 221 3 8.