Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11981 found under Hose by Westerbeke Corp. The National Stock Number assigned to this part is 4720012110892, 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 11981.