Inlet/Outlet: 3″. The Vernalift muffler was originally designed for small auxiliary propulsion engines installed near or below the water line in sailboats. In the early 70’s the quieting capabilities of lift mufflers were recognized. The Vernalift family expanded to include new and larger engines. Application: Inboards, Sailboats and Generators. Fuel type: Gas/Diesel. Waterline: Above or below. Sound rating: Better. Diameter 10.04″. Height 10.16″.