Johnson Pump Bilge Blower Flange Mount Johnson Pump radial flow design uses a squirrel cage type blower wheel to produce a substantial output at relatively low RPMs. Low noise level make Johnson Pump blowers excellent for use in heads galleys. Massive 3 diameter motor idles at 3100 RPMs 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 bracket