Thinner 'O' rings ?

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Externet

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Greetings.
Always remember/identify/used to the size of "O" rings in the tank valves just by looking at them. Now got to play with a valve branded 'Ocean Dynamics' and noticed smaller thinner (yellow) rings. Is there two sizes for CGA850 ? :oops:
Removed, compared with my spares, and yes, they are different.

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