Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 500.9400 ITEM 50 found under O Ring by Wandfluh Ag Hydraulikelektronik. The National Stock Number assigned to this part is 5331010925503, 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 500.9400 ITEM 50.