Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number I-2011-042.4 found under Indicator Sight Liquid by Icon M G T Systems Llc. The National Stock Number assigned to this part is 6680015929969, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like I-2011-042.4.