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