Allstar ALL50142 5/8-18 Thread for 3/8" Fuel Line Zinc Plated Inverted Flare Nut, (Pack of 10) Inverted flare nut has 5/8-18 threads for a 3/8 inch fuel line Finish is a quality zinc plating Inverted flare nuts are used for building custom length fuel lines Sold in one set of 10 pieces Backed by a 90-day limited factory warranty