Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R1 2IN.L57-01 found under Indicator Sight Liquid by Kone Oyj Hyvinkaan Tehtaat. The National Stock Number assigned to this part is 6680013731285, 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 R1 2IN.L57-01.