4LIFETIMELINES - 5/16" (.312") Copper Nickel Roll/Coil of Fuel or Transmission Line - 25 ft.

I purchased 3/16", 1/4", and 5/16" tubing. None of it would take a 45 degree double flare. I was using an Eastwood Professional Flaring Tool. The tubing was straightened, deburred (interior and exterior), lubricated, and then flared. I did this over 30 times with 3/16" tubing and several with the other two rolls. I think the material had been over annealed. It was so soft that the after first flaring operation (creating a bubble flare) the flare would collapse on itself. When the 45 degree flare was completed, the flare would have a "wrinkle" around the neck of the flare where the tubing had collapsed during the first operation. I returned all the rolls to Amazon. I purchased 3/16" tubing from Eastwood (made by BrakeQuip). This material produced a good flare the first time and every time after that. The 4LIFETIMES tubing will be a waste of your time and money.

So i used this line to replace an old rusted fuel line on my truck. The amount of line that i got was more than enough to replace my fuel lines mess up because of course i didn't measure it right and redo it once more. I fully intend on replacing my brake lines with it too. The biggest selling point for me was that it doesn't corrode as fast as steel lines. Easy to bend without kinking it and it's kinda pretty compared to the rest of the old rusty undercarriage. 9 out of 10 would buy again.

Not sure if its wall thickness related or poor quality but, even while using professional tube bending tools, these 5/16" lines KINK easily when doing >60 degree bends.I use a MASTERCOOL Pro flaring kit and have no problems with these when making flares, quick disconnects, etc --- it's the bending issues that are a problem.

I had used steel line before and with my flaring tool I wasn't able to make adequate flares, this is just enough softer that the flares were leak free with no "tweaking" Bends easy too. I'd suggest some protection if it is near any place that rocks or debris could hit it. My application left it pretty well protected.

I used these to replace fuel lines on 02 Burb 2500. Much easier for me to use these than buy prebent steel lines. I tapped these into existing Steels that weren't rusted out and used compression fittings. No leaks yet. I used Dorman compression fittings and also had swaglok double ferrule fittings. Both worked well.

Great product, a little pricey, but worth every penny. Strong enough, doesn't rust and can bend it to desired shape very easily. I always keep a 25 ft roll of 5/16 and 3/16 in my home garage for trans, fuel, and brake lines.

I had to replace the entire fuel system on my truck. This was used as a return line and it was AWESOME to work with. Very easy to bend with no tools worth every penny.

Didn’t even have to use a tube bender and these bent into place.