Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R2 1-2 found under Diaphragm Actuator Valve Special Shaped by Itt Grinnell Corp. The National Stock Number assigned to this part is 4820003697711, 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 R2 1-2.