Fits Indmar 4 Cylinder/ V6 And V8 Engines/ Mercruiser V6 4.3 Liter 175 To 205 Horsepower/ V8 5.0 To 9.4 Liter 200 To 800 Horsepower Alpha/ Bravo And Ssm Engines/ Omc 4 Cylinder 120 To 140 Horsepower/ V6 150 To 165 Horsepower/ V8 170 To 225 Horsepower Gm Engines; 1/2-14 Npt; For Water Temperature Up To 200 Degree Fahrenheit