Needle Free Connector expiry 2027 Needle Free Heplock STERILE by EO in Blister Pack Used in IV fluid, Medication Administration Color: BLUE Needleless connector connects to the end of vascular catheters and enable catheter access for infusion and aspiration. Needleless connectors (also known as NC's) were developed to reduce needlestick injuries, which occurs when the skin is accidentally punctured by a used needle.Needlestick injuries can be very serious and potentially expose a healthcare professional to bloodborne infectious diseases such as HIV/AIDS, Hepatitis B and Hepatitis C.