The Bridgeport 249-DC 4" EMT Zinc Coupling ensures that you have a proper connection between two lengths of EMT conduit. Taping the coupling prevents the entrance of concrete aggregate into the raceway, which could abrade conductor insulation or effectively reduce the area inside the raceway. The tri-drive set screws ensure that the connection between the two lengths of conduit stays securely in place. The die-cast zinc body provides corrosion resistance for long-term use. Also usable with aluminum EMT. Bridgeport EMT couplings come in a wide range of sizes and styles to provide complete installation flexibility, helping you install fast and deliver more. We engineer our EMT couplings with quality and innovation, allowing contractors to save time and money on every job. When you need quality electrical fittings for more efficient jobs, look for Bridgeport Orange.