Mercury - Stern Thruster Cowl for Pontoon JPO Control System 8M0180132. OverviewThis stern thruster cowl is the simple cover that protects the thruster on single-engine pontoons running Joystick Piloting. It keeps spray, dirt, and small debris off the thruster so it can do its job without getting gunked up. Once it's bolted on, it sits tight and doesn't buzz or rattle, even when the water gets a little rowdy. It's an easy swap that helps keep the back of the boat looking clean and cared for.. Ke