The Bridgeport EC-100 1" Mighty-Move® Steel Expansion Coupling permits lateral movement in EMT conduit caused by thermal expansion and contraction, preventing damage to conduit supports and electrical systems. Steel expansion couplings are useful in installations where temperature changes are expected. Thermal expansion and contraction can cause significant damage on long straight runs of EMT conduit. Steel expansion couplings help prevent potentially harmful thermal stresses in the EMT conduit or in any supporting structures. EMT conduit will have an added 2" to expand in either direction. Bridgeport steel expansion couplings come in a wide range of sizes and styles to provide complete installation flexibility, helping you install fast and deliver more. Our steel expansion couplings are engineered with quality and innovation that allow contractors to save time and money on every job. When you need quality electrical couplings for more efficient jobs, look for Bridgeport Orange.