A socket that closes a propeller to protect against injuries while falling into the water. At the same time it creates a jet effect that enhances the performance of the marine engine and improves its handling, which also reflects the less fuel consumption (environmentally friendly). Not suitable for speeds over 21 knots (39 km/h). Max. propeller diameter - 8.5 ''(21.6 cm), color - yellow, engine power - 9.9 - 20 HP.