Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SC000028 ITEM 3 found under Hinge Valve Right Hand by Cooper Valve Co. The National Stock Number assigned to this part is 5342011982905, 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 SC000028 ITEM 3.