providing {TAIL ~ a syringe body} having proximal and distal ends, a cylindrical passage, and a second lock element, located only adjacent {HEAD ~ the distal end} of said cylindrical passage, which mates whit said first lock element 
providing { TAIL ~ a syringe body } having proximal and distal ends , a cylindrical passage , and a second lock element , located only adjacent { HEAD ~ the distal end } of said cylindrical passage , which mates whit said first lock element
OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH