Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17251 found under Tubing Assembly Nonmetallic by Nycoil Co. The National Stock Number assigned to this part is 4720015557641, 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 17251.