{HEAD ~ The resilient nature} of the material causes {TAIL ~ the slits} to close and the fluid tight seal to be maintained when the catheter is withdrawn from the valve body 
causes
{ HEAD ~ The resilient nature } of the material causes { TAIL ~ the slits } to close and the fluid tight seal to be maintained when the catheter is withdrawn from the valve body
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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 OTH