Marine 4" Electric In-line Blower for Boats & Rvs .12v .Attwood Turbo 4000 ATTWOOD MODEL Turbo 4000 (1749-1). DIAMETER is 4 INCH and VOLTAGE is 12 Volts THIS BLOWERS IS CORROSION RESISTANT Nickel-plated motor. BUILT with Five-blade fan to maximize airflow and efficiency IT IS WATER RESISTANT and LOW AMP draw motor for longer blower and battery life MOUNTING FEET allow easy vertical or horizontal install Stiffening ribs to reduce housing distortion