Silencers are often deployed installed in luxury and other recreational vessels. The operating principle of silencers is based on the use of the cooling water motor to obtain a noise-damping effect in the exhaust system.

After the water is separated from the exhaust gases, they are discharged below the water surface. The exhaust gases that are free from water particles exert little counter pressure because of the small volumes of cooled exhaust gases. The noise level caused by the exhaust gases from the combustion engines is reduced to acceptable levels.