Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P99-117 ITEM 8 found under Seat Valve by Industrial Service And Supply Inc. The National Stock Number assigned to this part is 4820011937566, 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 P99-117 ITEM 8.