Tuff Automation supplies Salco CA doors, and there isn't a better product for sealing your rooms gas-tight with ease. We offer Salco doors at competitive prices. A standard in the European fruit industry, Salco gas-tight doors are constructed with a lightweight polyester surrounded by an aluminum framework and then finished with impact-resistant fiberglass. They slide easily along a stainless steel track, and can be sealed completely in as little as 2 minutes with only one operator.