SEAFLO 3” In-line Blowers provide ventilation for bilges, engine compartments, galleys and heads. Designed for efficient, high output operation, these blowers feature our exclusive front and rear shaft seals and corrosion resistant motor housings for long life. Compact and easily installed on any flat surface, SEAFLO In-line Blowers provide higher air flow and lower amp draw. We have 2 types of boat bilge blowers now in stock 3" and 4".