It is {TAIL ~ an object} of the invention to provide {HEAD ~ an integrally formed piston} and seal therefor 
It is { TAIL ~ an object } of the invention to provide { HEAD ~ an integrally formed piston } and seal therefor
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH