Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 85506 found under Disk Valve by Ashcroft Inc. The National Stock Number assigned to this part is 4820000361979, 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 85506.