Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D3800-A066 ITEM 10 23 found under O Ring by Dante Valve Company Inc. The National Stock Number assigned to this part is 5331001675172, 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 D3800-A066 ITEM 10 23.