Which measurement is the OD of the hard plastic fitting? NOT the OD of the line..
OD of this fitting would then be the approx ID of the line needed...
If you can have your caliper on this part when you take the photo, so we can verify you measured at the correct point...
9.95mm is the OD of the fitting that goes into the red plastic ring. Measured on the portion that goes into the fitting. The ring is marked 9mm as well.
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