Fuel Line Extension, Straight, One 5/8-18 in Male O-Ring to 9/16-18 in Male O-Ring, One 9/16-18 in Female to 9/16-18 in Male O-Ring, Steel, Zinc, Kit. Trans-Dapt offers a wide range of custom engine components to boost both the performance and style of many vehicles. Their product line includes oil pans, oil filter relocation kits, valve covers, custom air cleaners, throttle body spacers, dress-up kits, and much more. FUEL LINE EXTENSION KIT. 0.24 lbs 0.11 kg. 3.6 in 9.14 cm. 2.75 in 6.99 cm. 1.2 in 3.05 cm. Fitting A End 1 Size. Fitting A End 1 Style. Fitting A End 2 Size. Fitting A End 2 Style. Fitting A End 2 O-Ring. Fitting B End 1 Size. Fitting B End 1 Style. Fitting B End 2 Size. Fitting B End 2 Style. Fitting B End 2 O-Ring.