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