Do things get too close for comfort when entering your slip? The Vetus stern thruster gives you more control and less of the worry of bumping against other boats in the marina. The Vetus stern thruster turns out 121 pounds of thrust with a propeller just 4 inches in diameter. The thrusts fit snuggly on the transom of any sized boat with a tunnel just 9 inches long and 6 inches wide. The thrusters come complete with mounting hardware, and they're easy to install. Prices start at $311.