strange stuff on valve

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extremely unlikely no other tanks have it ( ones that ive checked -im checking dil tanks today )
Time to give feedback!

Do not be overly harsh, as mistakes do happen and a friendly attitude is more likely to result in actual change.
 
That's a combo of grease, rust, and a dash of h20.

What does the inside of the cylinder look like?
 
https://www.shearwater.com/products/swift/

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