 That little nut, I guess you could call it. It gets loose, and then the next thing you know, you've got some heating issues with trying to draw power for your air conditioner or anything that might be running on the boat, refrigerator even. So make a switch. It's a retrofit connector called the smart plug. It's very easy to install. You can do it very easily yourself. It's pretty easy as far as the amount of time and that it's going to take to do it.