The restricting apparatus includes a member having a first surface, {HEAD ~ a second surface} opposing {TAIL ~ the first surface} and an opening between the first and second surface for restricting the fluid flow therethrough 
opposing
The restricting apparatus includes a member having a first surface , { HEAD ~ a second surface } opposing { TAIL ~ the first surface } and an opening between the first and second surface for restricting the fluid flow therethrough
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH