Replacement thermostat only suitable for:

Beta 16 & 25 Heat Exchanger & Keel Cooled engine variants

Beta 28, 30, 35, 38 & 45T Heat Exchanger & Keel Cooled engine variants

Beta 43, 50 & 60 Heat Exchanger & Keel Cooled engine variants with side mounted stop solenoid

Please check your owners manual for the part number to check it matches your engine.