color of rubber on 02 scavenging caps

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smokinghole

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Before I contact a retailer I wanted to check on something. I ordered some caps that are supposed to be 02 scavenging. Every 02 scavenging cap I have seen has a grey opaque rubber coating. The caps I got have a white semi transparent rubber coating.

There's an $8 difference for the quantity I ordered. It's not a huge deal but I still want to make sure.
 
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