art application of a force to the torsion bar 244 causes the torsion bar 244 and latch 242 to rotate around the fulcrum portion 246 this rotation allows the latch 242 to rotate radially outwardly from the peripheral opening 238 and permits the standard luer fitting to proceed past the latch 242 when the force applied to the torsion bar 244 is released or removed the latch 242 and the torsion bar 244 return to their initial positions or to a relaxed or stress free state the optional standard luer fitting 220 shown in fig6 includes an open proximal end 229 and a distal end 221 which includes a needle cannula 222 having a lumen 223 the open proximal end 229 of the standard luer fitting includes an extending lip 224 as more clearly shown in fig8 and 9 when assembled in a snap fit relationship the open proximal end 229 of the standard luer fitting moves into the cavity 232 proximally past the latch 242 of the torsional snap fit element 240 and into the peripheral opening 238 as otherwise described herein application of a radially inwardly directed force on the torsion bar 244 causes the latch 242 and torsion bar 244 to rotate around the fulcrum portion 246 as the extending lip 224 moves past the latch 242 after movement of the extending lip 224 proximally past the latch 242 the force applied to the torsion bar 244 is released and the latch 242 and the torsion bar 244 return to their initial position with the latch 242 positioned proximally adjacent to the extending lip 224 in accordance with one or more embodiments this initial rotation and return to an initial position provides tactile indication.