Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM17 found under Tubing Nonmetallic by B And B Tritech Inc. The National Stock Number assigned to this part is 4720001558048, 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 SM17.