To create an aesthetically pleasing automatic, in-ground pool cleaner, designers gave the G4 unique components. The rudder functions as the device's steering mechanism, affording the unit better balance, directional stability and enhanced coverage. The sail is a transparent bridge that provides extra rigidity and assists in steering around steps, corners and other obstacles. The Dual Durometer Disc works in conjunction with the sail to provide ultimate cleaning efficiency. The device's sleek, skeletal construction is intended to attract consumers looking for a stylish and premium pool cleaner. The unit has only one moving part ensuring a long life and low cost maintenance.