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Is your engine a Pro XS or a regular Optimax?
Would you say that the leak in located at the bottom of cylinder 11?
What you are looking at is actually a milling passage during the manufacture of the cylinder, not a vent. The trim system is totally closed due to it being under water most of the time. Your cylinder is missing the little BB, that is normally in that hole. You can try to remove the cylinder, sand of the paint around the hole, get it really clean using acetone, then use a product called Marine-Tex to try and get the cylinder to seal up. The system produces over 1500 PSI when going up, so the repair may not hold. If it does not, you will need a new cylinder.
It is possible that just over time the BB was either knocked loose, corrosion got in the paint and ate the metal away, it was not installed totally when manufactured and just worked itself loose over the years.
There is no part number for it, even at my day job in a shop, we could not get this. I would either need to locate a BB and then try to use the Marine-Tex to hold it in, or replace the cylinder.
The bb is just right there at the end. There are others on the system that you can see as well. Al you need to do is cover the end of the hole well to stop the leak.