Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS-91K-65ITEM19 20 found under Seat Valve by Whitey Co. The National Stock Number assigned to this part is 4820013776369, 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 SS-91K-65ITEM19 20.