Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 543-742 found under Hose Nonmetallic by Veyance Technologies Inc. The National Stock Number assigned to this part is 4720015781868, 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 543-742.