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Joel's Garage: Quiet Generator Muffler
I just installed a Walker 18479 muffler from pep boys on a 2250 watt 5 hp Coleman Generator. I used a 3/4 pipe nipple and 1 90 deg elbow out of the engine and pointed up. Another 3/4 nipple and a 3/4 by 1.5 reducer were added. I bored out the 1.5 end on a lathe to take a slip fit of the the muffler pipe. This connection was brazed together.