Johnson Pump In-Line Blower Johnson Pump In-Line Blowers provide ventilation for bilges, engine compartments, galleys, and heads. Available in 3 and 4 sizes, these blowers are made from high quality ABS plastic construction, corrosion-resistant motors, and premium electrical connections. Johnson In-Line Blowers are compact and feature mounting feet that make installation easy on any flat surfaces. Five blades Quiet operation Highly efficient Reliable operation Specifications 3 Blower 12V Capacit