Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HL-21312PC621 found under Valve Globe by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 4820011482563, 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 HL-21312PC621.