I bought two 20ft fuel line segments for my 2006 GS300. One of them is clearly out of specification. The outside diameter of the 6AN line should be between 13.7 mm (0.54 in) and 14 mm (0.55 in) and measured as the 14.4 mm (0.567 in) outside diameter of the line. However, for those who aren't in the know, this doesn't seem like such a big deal. This meant the reel was virtually unusable. Every fitting I tried to turn was wrinkled and crumpled the end of the hose rather than slipping off, even with quite a bit of force. However, the hose listed in the spec seems to be of pretty good quality too its very easy to cut and bend and seems pretty sturdy especially for the price! just remember to check the size before using.