Abstract: A trim tab device that serves as a propeller guard for a boat's motor is provided. The trim tab device includes a trim plate having a bracket removably mounted to a boat motor. A hollow cylindrical shell is integrally attached to a base portion of the trim plate. The hollow cylindrical shell defines an inlet opening and an outlet opening. The hollow cylindrical shell is configured to encircle a propeller of the boat motor. The hollow cylindrical shell directs waterflow through the propeller from the inlet opening to the outlet opening. A fin extends outwardly from the hollow cylindrical shell and is configured to securably attach to the boat motor.