{HEAD ~ A piston valve} and a piston are fastened into an inner compression chamber inside {TAIL ~ the compression cylinder} 
{ HEAD ~ A piston valve } and a piston are fastened into an inner compression chamber inside { TAIL ~ the compression cylinder }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL