Wolf-Pak® SmartSite® Needle Free Valve. One of the most widely used in the world earning its reputation as a proven, reliable system. Flat, smooth top: easy-to-swab. Straight-through, non-tortuous fluid path: reduces the risk of hemolysis. Passive system: increases compliance and eliminates the need for caps and cannulas. Labeled for use with low pressure power injectors up to 325 psi and maximum flow rate of 10 mL/sec: can be used in radiology. High chemical compatibility and lipid resistant: suitable for use with a wide variety of drugs.