Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PR50-6-2 (OXY CLEANED found under Valve Regulator Ay by Circor Aerospace Inc. The National Stock Number assigned to this part is 4820014732153, 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 PR50-6-2 (OXY CLEANED.