Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 900-035 ITEM 12 found under O Ring by R And M Fluid Power Inc. The National Stock Number assigned to this part is 5331014063107, 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 900-035 ITEM 12.