Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AN6018-1 found under Valve Check by Aeronautical Standards Group. The National Stock Number assigned to this part is 4820005359741, 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 AN6018-1.