Andy,If you have any questions concerning the C25, I would encourage you to visit the C25/250 National Association and especially the Sailor's Forum at this site. Click on the related link to take you to the Spec's page from the above mentioned website.
I also have an '83 Catalina 25. The fresh water tank is 16 gal. I don't have the holding tank (use a porta-potty) so can't help you there. Try the 25/250 Association web site.
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