The Weber MPE-750 marine engine has an exhaust gasket that is designed / intended for average temperature lake, river and ocean waters. The normal production gasket is item 401145 (available here), but if you are using the tender or watercraft in a very warm climate; you might need the 102366 exhaust gasket, as the larger openings will allow more water flow through the cooling system. This is often a good part to order when installing the MPE-750 exhaust manifold repair kit and /or the exhaust pipe.
