I few years ago I had a link for a company that made a quick connect winterization system that replaced all of the Mercruiser blue drain plugs with brass fittings with barbs that connected a hose from each of these fittings to a valves. To winterize you just had to open each valve and pump water out and reverse to pump antifreeze back in. I think that the company was in Arkansas. I can no longer find the link for that company. Anyone remember them?