1. A transparent dressing lets you observe the insertion site for phlebitis, infiltration, and infection without disturbing it. Also, because it's waterproof, you won't need to replace it routinely unless it loosens. Apply it directly to the site without stretching it (which may make the patient's skin itch). It should cover the catheter and part of the hub. Use the heat of your hand to seal it snugly to the skin.