Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Y12N175B580 found under Valve Regulator by Airgas Safety Inc. The National Stock Number assigned to this part is 4820016056839, 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 Y12N175B580.