Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31B3-129 found under Hose Assembly Nonme by Ellis And Watts International Llc. The National Stock Number assigned to this part is 4720011454820, 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 31B3-129.