My current boat is a Cigarette Cafe Racer. We have had an extremely cold winter with temps at or below zero almost every night. I keep my boat in an uninsulated pole barn. I winterize by running 6 gallons of pink antifreeze through each sea-strainer. I am always worrried about trapped water in a cavity inside the block. No worries now! Andrew W Millstadt, IL Nothing but the best for my baby! No fear of explosion due to fuel vapors igniting with your ignition protected units.