There is only one lower 0-ring. There is an upper one with the check valve. Typically the lower one needs replaced if the coupler is leaking.

What size in millimetres is the lower o ring for the Harley check valve?

As someone who has tried to replace the o-rings both with and without this tool, i will recommend whenever possible to just replace the whole assembly, hose and all with the oem part. save yourself the hassle.

where is the product made? thanks.

The tag and card inside have no info. Maybe if you go to fueltool.com you can find the answer.

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Fuel-Tool EFI Check Valve Lower O-Ring

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