The user’s query for “-3 1/2 Eye Banjo” likely contains a typo for a “-3 AN 1/2-inch Eye Banjo” fitting, based on product listings from automotive and hydraulic parts suppliers. This type of fitting is used in fluid transfer applications like fuel, oil, and brake lines. The AN refers to Army-Navy specifications for high-performance fluid transfer components, while the eye banjo shape allows for fluid flow and tight installation.