Below is a list of Gum Rubber Tubing manufacturers from California. Gum rubber tubing is another name for natural rubber tubing that provides a pathway for liquids and gases. Natural rubber is derived from natural latex and synthetic rubber comes from processed petrochemicals; the term gum rubber refers the naturally derived version. Gum rubber tubing can range in outer diameter, inner diameter and wall thickness. It is usually tan or white in color; colorants may be added, though this interferes with the purity of the rubber.