The needle free connector is an essential device that connects to the end of a vascular access device (VAD), catheter/cannula extension set, to enable catheter access for injection, infusion, or aspiration. Using a needle free connector reduces the risk of occlusion, microbial and/or water ingress, or seepage from the catheter or cannula. It also requires no needle for access thus preventing the associated risk of a needlestick injury (NSI).