The rearward section includes an interior chamber and an opening or channel that extends from the chamber to provide {HEAD ~ a water flow path} between the chamber and {TAIL ~ the surrounding body} of water 
between
The rearward section includes an interior chamber and an opening or channel that extends from the chamber to provide { HEAD ~ a water flow path } between the chamber and { TAIL ~ the surrounding body } of water
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH