With the piston 35 adjacent the rear end 33 of the tubular member 29 and {HEAD ~ the nozzle} 11 separated from {TAIL ~ the front end} 32 of the tubular member 29, viscous material 20 encased only in a flexible sleeve 60 can be positioned within the through opening 31 of the tubular member 29, the end of the sleeve 60 at the front end 32 of the tubular member 29 can be opened, and the flange 59 on the nozzle 11 can again be sealed across the front end 32 of the tubular member 29 
With the piston 35 adjacent the rear end 33 of the tubular member 29 and { HEAD ~ the nozzle } 11 separated from { TAIL ~ the front end } 32 of the tubular member 29 , viscous material 20 encased only in a flexible sleeve 60 can be positioned within the through opening 31 of the tubular member 29 , the end of the sleeve 60 at the front end 32 of the tubular member 29 can be opened , and the flange 59 on the nozzle 11 can again be sealed across the front end 32 of the tubular member 29
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