Hard walls give this tubing the strength to handle high-pressure fuel and gasoline applications. It is nylon, which has excellent abrasion resistance. This tubing can be brittle, so take care as you're handling it. To ensure a good connection when installing fittings, trim damaged tube ends with a plastic tube cutter (sold separately).

Clear tubing makes it easy to monitor flow. It is semi-flexible, so it is good for gradual bends.