Fitting, Fuel Line Adapter, Straight, 6 AN Male to 3/8 in Male Spring Lock, Stainless, Natural, Ford Return Lines, Each. OF SPRING-LOCK TUBE IS. Their product line includes fuel pumps, fuel systems, regulators, filters, rails, and kits, as well as application-specific components. 6AN S/S COUPLER TO FORD RETURN LINE. 0.08 lbs 0.04 kg. 3.75 in 9.53 cm. 2.65 in 6.73 cm. 1.25 in 3.18 cm. Fitting End 1 Size. Fitting End 1 Style. Fitting End 2 Size. Fitting End 2 Style.