Hoosier
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It might be for newbie like the colored computer cables. After figure out the exact route, it isn't a big deal. Even, each hose has a different length so it makes the hose idenfication much easier. Personally, I like all black hose with the simple reg unlike my buddy. Just my 2 cents....
lairdb:I've thought more than once that the BAUE pictures, and similar how-to-route galleries would be WAY clearer if colored hoses were used.