The last fuel line you'll need! To anyone who's reading this, hello there, you're about to buy something definitely worth while! The heavy duty fuel line looks good with its bright blue color, rather than the old off-white or black fuel lines either given in the kits or bought separately on this site, it's definitely an upgrade! This fuel line is thicker and made of harder and far more durable plastic giving it a few advantages over the old versions. It's bend nicely but it's slightly thicker so it doesn't kink like the old ones and it also doesn't fade or get dirty at all. Sure it may get some dirt on it but it wipes clean and stays that bright blue like brand new out of the box, instead of getting dirty and turning a brown color over time like the old ones did. Because this new fuel line is a heavier duty, it last longer and will withstand normal wear and tear with a breeze, barely being affected after years of use, but that's just the normal durability. How about any factors leading to it failing like heat, you might ask? Well it will hold up nicely in a number of different environments. It withstands cold weather without cracking or stiffening and high temperatures as well having a high heat resistance against the heat of a 100+ degree day in the sun and the engine itself. If for any reason it happens to accidentally touch a very hot part of the engine, it won't melt right away for even in a minute or so. It actually resists the heat so well that I personally have an instance where if I didn't have this fuel line, and only had the older one, I wouldn't have my bicycle any longer, it would have quickly blown up without any warning and I would have still been on the bike trying to get home. I was riding my bicycle down a mountain against a very stressful terrain of rocks and my gas tank had broken free and slid down the top row tube where its mounted. because it was staying on, i simply used one hand to hold my gas tank upright so it didn't leak all over the place only long enough for me to get home as fast as possible. Well, upon inspection I saw that because my gas tank had slid down so far, my heavy duty fuel line was pressed right up against my very hot engine and had stayed there for the 5 minutes it took me to get back home. there was very minimal melting and it still sustained a proper seal. Now of course I bought a fresh fuel line for my bike (as well as a new gas tank), however, it held up so well that it could actually be used again considering it only had two tiny little burn marks on it from the hot fins of the motor head. If I had used the older fuel lines, which have little to no heat resistance, then it would have melted through and the gas would have ignited causing my bike to blow up. I'm very thankful that I chose to purchase this fuel line and you should be too!