Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EFI540BRASS1INCH found under Indicator Sight Liquid by Ernst Flow Industries Inc. The National Stock Number assigned to this part is 6680014168415, 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 EFI540BRASS1INCH.