Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3MB-189 found under Hose Assembly Air Duct by Sulzer Metco Us Inc. The National Stock Number assigned to this part is 4240014596705, and the Federal Supply Class is 4240 Safety And Rescue Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3MB-189.