Flaring gave me a couple of challenges. I had to grind down the flaring tool a little so the tool would grip the metal lines. The stock lines are just under 5/8 inch. That wasn't that big of a deal. I have a shop. The other was as you can see in one of the pictures, The stock lines on the cooler have a sharp bend in them with very little straight sections to stick in the flaring tool. It worked but it was very tight.This is why I am looking for used lines from the oil filter end, They have long straight sections. These were a piece of cake to flare. I also don't like the bend in the one picture and want to clean it up.
System works great though! I have driven it over 100 miles trouble free. Very confident that this will not fail. I did cover the rubber hose with another piece of hose split down the middle to protect the lines from any rub failure.