The assembly is provided with ribs extending entirely around the bottom surface of {HEAD ~ the seat} for {TAIL ~ improved structural support} 
The assembly is provided with ribs extending entirely around the bottom surface of { HEAD ~ the seat } for { TAIL ~ improved structural support }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL