allow fluidic communication between a supply source 380 and an opening 381 positioned near the end of the nozzle 350 the injection plug 320 of the present embodiment also includes a spring bias ball valve assembly 332 in one embodiment the nozzle 350 is selectively fastened to one end of the injection plug 320 as shown in fig4 the nozzle 350 may be attached to the injection plug 320 by the use of a connector 351 such as a latch threaded connection or the like in yet another embodiment the injection plug 320 comprises a rod 352 that is formed and configured to be slidedly inserted into the nozzle 350 when the nozzle 350 is attached to the injection plunger 320 the ball valve assembly 332 includes a spring 336 and a ball 338 the spring 336 normally biases the ball 338 against a chamfered portion 333 formed within the nozzle 350 thereby displacing the ball valve assembly 332 into a closed position in operation when the injection nozzle is fully threaded the rod 352 extends through the nozzle 350 and displaces the ball from its seat allowing fluid gasses or air to move in either direction upon completion of the injection process the nozzle 350 can be detached from the plug 320 thereby withdrawing the inner.