Johnson Pump In-Line BlowerJohnson 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 bladesQuiet operationHighly efficientReliable operationSpecifications:3″ Blower12VCapacity: 158 CFMPort Connections: 3″4″ Blower12VCapacity: 240 CFMPort Connections: 4″