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