Simply slide tubing into tube nut install ferrule attach tube end. Rated up to 250 psi.

Edelbrock 8123 Fuel Pump To Fuel Pressure Regulator Fitting
Hard fuel line to an fitting. It is mandatory for you to apply a double flare to every line end and fitting. Tubing to an fittings with ease. Lightweight inexpensive and easy to use russells aluminum fuel line is available in three sizes and four finishes to fit virtually any fuel system. Used where a flexible fuel line is not required it is easily contoured to route along frame rails and chassis tubes. Connect to fuel line adapters using russell tube nuts and tube sleeves and a 37 flaring tool or our hard tube adapters. When you are flaring brake and fuel lines it is suggested you use a lubricant at the flaring head and line end.
Tube to 6 an male or female end and 12 in. Sold in 25 ft. Buy aluminum fuel hardline fitting hard fuel tubing fitting for hardline tube 516 inch 79mm od to an6 female thread connector red blue. Tube to 8 an male or female end. Hard tube an adapters connect 38 in. Worry no longer about flaring and splitting aluminum tubing to make connections.