manually actuateable and adjustable means for applying {HEAD ~ air} under {TAIL ~ a predetermined pressure} to the side of said piston adjacent said rear end at a desired rate to cause forceful movement of said piston from said rear end to said front end of said tubular member 
under
manually actuateable and adjustable means for applying { HEAD ~ air } under { TAIL ~ a predetermined pressure } to the side of said piston adjacent said rear end at a desired rate to cause forceful movement of said piston from said rear end to said front end of said tubular member
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH