In an obturator comprising a forwardly tapered male plug with a shaft extending from the forward end thereof, said plug including locking means for releasable engagement with projecting dogs on a catheter fitting having an inwardly tapered smooth female portion upon {HEAD ~ insertion} of {TAIL ~ the obturator} into the catheter fitting, the improvement comprising: 
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In an obturator comprising a forwardly tapered male plug with a shaft extending from the forward end thereof , said plug including locking means for releasable engagement with projecting dogs on a catheter fitting having an inwardly tapered smooth female portion upon { HEAD ~ insertion } of { TAIL ~ the obturator } into the catheter fitting , the improvement comprising :
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