Fitting for smooth wall tubes

A fitting for mounting to the end of a smooth wall tube to seal the inside diameter thereof, said fitting comprising a body having a passageway extending longitudinally through it;

• a collet operator at one end of said body having an aperture in it in axial alignment with said passageway in said body and a cam surface on an outer surface thereof;
• a shaft slidably disposed within and extending through said passageway in said body and said aperture in said collet operator;
• means coupled to one end of said shaft and operable to slidably reciprocate said shaft;
• an elongated tubular split collet slidably disposed about at least a portion of said collet operator and having a cam surface on an interior diameter thereof operatively engageable with said cam surface on said collet operator and an outer surface on said split collet operatively engageable with the interior surface of said tube to grip said tube without deforming it;
• biasing means disposed between said collet operator and said split collet for normally urging said split collet out of engagement with said collet operator;
• the other end of said shaft having sealing means retained thereon;
• said split collet and said collet operator being forcibly urged together to engage said cam surfaces to thereby cause said split collet to grip the inside diameter of a tube and said sealing means being compressed into sealing engagement with the inside diameter of the tube when said shaft is operated, said sealing means and said split collet being disposed with respect to one another so that the sealing means engage the lower end of said split collet to raise the latter to engage said cam surface on it with said cam surface on said collet operator.