Top Head 9/16", Bottom Head 1 3/16"; CS jacket 9/16" thick. Top mounted Lightnin drive, Model 85-5-40, 9.33 to 1 ratio, Direct coupled to a 5 HP 3/60/230/460 volt 1765 rpm motor, 180 RPM output. (4) blade pitched paddle mid shaft, 4 blade flat turbine on bottom, (4) baffles on side wall.