How do we make sure that we are using the correct O ring?

Using the incorrect o ring material for an application will inevitably lead to premature failure and leaks. Typically OEM supplied O rings will be correct but what about the O rings we get from O ring kits and off the shelf suppliers? Before installing these orings we should check the material is correct. Here is one quick way to identify O ring material. https://kvgo.com/Example/oringtester

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