Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 890-6STR22 3-8IN found under Indicator Sight Liquid by Superior Valve Co. The National Stock Number assigned to this part is 6680003021417, 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 890-6STR22 3-8IN.