The hollow, vinyl plastic ribs are inflated with {HEAD ~ air} through an air valve located in {TAIL ~ the foundation rib} 
The hollow , vinyl plastic ribs are inflated with { HEAD ~ air } through an air valve located in { TAIL ~ the foundation rib }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL