{TAIL ~ The piston head} is fitted into a cylinder which divides {HEAD ~ the cylinder} into two hydraulic or pneumatic cells 
{ TAIL ~ The piston head } is fitted into a cylinder which divides { HEAD ~ the cylinder } into two hydraulic or pneumatic cells
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH