Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K23-212-111-311 found under by George T Hall Co Inc. The National Stock Number assigned to this part is 4820123429808, 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 K23-212-111-311.