Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 900-120-100 found under Valve Check by Tiffin Metal Products Co. The National Stock Number assigned to this part is 4820008706191, 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 900-120-100.