In addition, the skirt valve typically lacks {HEAD ~ a spoke} to hold {TAIL ~ the center} of the valve in place, and therefore lacks the problems associated with the spokes catching foreign objects 
to hold
In addition , the skirt valve typically lacks { HEAD ~ a spoke } to hold { TAIL ~ the center } of the valve in place , and therefore lacks the problems associated with the spokes catching foreign objects
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH