In one embodiment, the corrugation have a pitch of {TAIL ~ five inches} and a height of one half inch; in {HEAD ~ another embodiment}, the pitch is six inches and the height is one inch 
In one embodiment , the corrugation have a pitch of { TAIL ~ five inches } and a height of one half inch ; in { HEAD ~ another embodiment } , the pitch is six inches and the height is one inch
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH