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I have a manual one installed in my Sport 15 so I can flip it on with a switch and pump out the water that gets in when the kids get back in the boat. The plug remains in and the outlet dumps into the splash well - the water then drains out the splash well drain tubes...I also made a nice mahogany cover for the bilge so you you can step on it when moving around the back of the boat. I added a picture of the cover to my personal page.