Size of ballast fill lines?

[Fman]

I am going to be extending my ballast fill line approx. 1 ft on each side, and wanted to know if anyone knows the size and where to purchase the exact match of line Supra is using on there boat? I think the line is 1/2" but not 100% on this. Its only flowing water so any line that can handle a little pressure would work, but I would like to keep it clean and purchase the "black" lines they are using on the boat.

Thanks for any feedback....

[JohnnyH]

I think its 3/4