I recently got an Ottawa 10 gal. visible with an older restoration. I have a question about the cylinder. The pics aren't great, but would this be the correct one for this pump? The numbers are etched. It also has a "G9" etched at the very top. The reason I ask is, it appears there might have been 2 holes in the lower cylinder casting that may have been for gallon markers. Everything that I've read though seems to indicate that Ottawa's only had etched cylinders. The pump also has cylinder rods.