PTFE Fuel Line: Best for Oil gas line, Fuel hose, Clutch hose. Recommended for E85, Alcohol, Nitro, transmission, clutch, nitrous, power steering, oiling, hydraulics & vacuum applications.Universal Models: The fuel line hose fits different brands of different cars. Just choose the right size.Safety Features For Your Protection: The product has good flame retardancy and excellent corrosion resistance.Long Life: Inner core PTFE has excellent corrosion resistance. It is maintenance-free and precision-engineered to increase life.Professional Installer is Highly Recommended (No Instruction Included) Installation Step 1Wrap the hose end with tape, this will help minimize fraying. Cut hose to length using a very harp fine tooth hacksaw or cut off wheel.After cutting, remove the tape, and trim off any loose wires with a knife or sharp shears. Then thread/slide socket the hose end with care. Repeat with the second socket.TIP: The second socket should be put on backward. Installation Step 2Use a pick of separator tool, to peel away the outer braid and clear about 1/2 inch of PTFE inner tube. Installation Step 3Take one of the brass ferrules and press it snuggly against the exposed end of the PTFE inner-tube. Complete positioning of the sleeve by the hose end against a flat surface. The PTFE inner-tube should fit into the tip of the ferrule. Installation Step 4Insert the nipple into the PTFE inner-tube so that the base of the nipple fits squarely against the brass ferrule. After starting the process by hand, may want to press against vice jaws or hard surface, to ensure fit. Installation Step 5Pull the socket down over the peeled away outer-braid and the brass ferrule and begin to thread the socket to the nipple by hand. Installation Step 6Once the socket and nipple start to the thread, place the nipple in our pair of vice jaws and use the assembly tool or adjustable wrench to complete the assembly. Installation Step 7All done with the first end, now repeat for the second assembly starting at step 2.