The scrubber drum includes at least two sections {HEAD ~ each} of which has {TAIL ~ a polygonal shaped, water tight interior chamber} 
has
The scrubber drum includes at least two sections { HEAD ~ each } of which has { TAIL ~ a polygonal shaped , water tight interior chamber }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL