MDi is a world-leading American manufacturer of Hot Runner Systems and components with the capability to develop custom and innovative solutions for the plastic injection molding industry. Established in 1984, MDi continues to offer experience in the design and manufacturing of complete, internally heated and balanced precision Hot Runner Systems, Valve Gate Systems, Hot Sprue Bushings, Molding Machine Nozzles, Filter Nozzles, and MDi’s unique system components and controls. All of our components are in-house designed and manufactured at our facility in St. Charles, IL, with a focus on quality and reliability.