Smith & Nephew Opsite IV3000 Standard Moisture Responsive Catheter Dressing 4" x 5-1/2", Waterproof, Box of 10. 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. Smith & Nephew Opsite IV3000 Standard Moisture Responsive Catheter Dressing has low allergy, grid pattern adhesive. Transparent and conformable. One-hand delivery system. High moisture vapor transmission rate film. Waterproof.