Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AM3P1108 BUTYL-S20 found under Valve Check by Almo Manifold And Tool Co. The National Stock Number assigned to this part is 4820012110904, 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 AM3P1108 BUTYL-S20.