Johnson Pump Bilge Blower Flange MountJohnson Pump radial flow design uses a squirrel cage type blower wheel to produce a substantial output at relatively low RPM's. Low noise level make Johnson Pump blowers excellent for use in heads & galleys. Massive 3" diameter motor idles at 3100 RPM's assuring long life. Housings are molded of tough glass filled composite resin. Flange Mount #54124 - Conventional design outlet flange to mount directly to the exhaust opening in the hull. Molded mounting brackets simplify installations; 3" Diameter; 112 CFM; Direct replacement for old Mayfair Flange Mount Bilge Blowers;