Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WD-00442-12C ITEM 13 found under O Ring by Pall Aeropower Corporation. The National Stock Number assigned to this part is 5331005841840, 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 WD-00442-12C ITEM 13.