{TAIL ~ The apparatus} 50 includes a member 52 having a first surface 54, a second surface 56 disposed in an opposing relationship with the first surface 54 and {HEAD ~ an opening} 58 between the first and second surfaces for restricting fluid flow therethrough 
{ TAIL ~ The apparatus } 50 includes a member 52 having a first surface 54 , a second surface 56 disposed in an opposing relationship with the first surface 54 and { HEAD ~ an opening } 58 between the first and second surfaces for restricting fluid flow therethrough
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 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