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