Zero G Water Hoses: What's the difference between the grey & the blue versions?

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Zero G Water Hoses: What's the difference between the grey & the blue versions?

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Teknor Apex-4006-25 Zero-G 1/2 X 25', Blue : Automotive

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Zero-G Water Hose Review

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See Why I Love This Zero- G 50 foot Hose! It Works SOOOO Well!