Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D129-14-541 ITEM 9 found under O Ring by Tyco Valves And Controls Lp. The National Stock Number assigned to this part is 5331014205390, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D129-14-541 ITEM 9.