A needle is positioned on {HEAD ~ the end} of the cylinder and discharges liquid through an opening as the plunger forces the liquid to the bottom of {TAIL ~ the cylinder} 
A needle is positioned on { HEAD ~ the end } of the cylinder and discharges liquid through an opening as the plunger forces the liquid to the bottom of { TAIL ~ the cylinder }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL