Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 90988 ITEM 7 found under Disk Valve by Ulstein Bergen A S. The National Stock Number assigned to this part is 4820012904383, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 90988 ITEM 7.