Colored Nylon Vacuum Lines

[fender559]

Hello, why did Ford use nylon colored vacuum lines as opposed to rubber lines? I have a 1999 Ford Ranger XLT, 3L Flex fuel and like to know the sizes and where can I get some?
Thank you for your help.
James

 

[pjtoledo]

nylon has more resistance to collapsing and decomposing than rubber.

 

[scotts90ranger]

and color coding makes it easy to make a EPA required sticker under the hood and reduces the chance of connecting things wrong. If you can find any with ~1/8" ID or 3mm ID that would work fine I imagine, I'm pretty sure there's some HDPE tubing that would work fine which is like ice maker tubing... or something like THIS, there's some 1/8" nylon available as well...