Smith & Nephew Opsite™ IV3000™ Standard Moisture Responsive Catheter Dressing 4" x 8", Waterproof Smith & Nephew Opsite™ IV3000™ Standard Moisture Responsive Catheter Dressing is specifically designed to meet the needs of catheter fixation and to keep the catheter site dry. It offers safe, secure and cost effective catheter fixation and is believed to be a technological advance for IV site care. Provides quick and easy application to all major catheter types.