Glenn Posted June 15, 2009 Share Posted June 15, 2009 Biggest pipe that will go through the hole in the break drum. I use 2-1/4 in one drum with 2 pieces of 1/4 inch round bar crossed for a grate, 3 inch pipe in the other drum with 2 parallel pieces of 3/8 bar. Lots of room for air, whether a gentle whisper of air or a full blast of air. Quote Link to comment Share on other sites More sharing options...
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