Grace Medical uses a proprietary cold mold injection process when manufacturing silicone vent tubes. Cold mold injection produces small silicone products with a highly complex molded geometry, minimal flash and a mirror surface finish. The smoother surface, created by the silicone curing from the inside out, provides less area for bacteria adhesion. During traditional molding the vent tube is cured from the outside in, creating an “orange peel” effect on the surface of the tube. Traditional molding creates a rougher tube surface which may create a platform for bacteria adhesion.