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