Use Bridgeport’s 257 3" Steel EMT Compression Connectors to make quick, concrete-tight seals between electrical metallic tubing and an electrical box or enclosure. A rugged steel construction and electroplated zinc finish ensures both durability and excellent corrosion resistance in harsh environments. To install, simply insert EMT into the connector and tighten down the compression ring to secure the tubing in place. Then, fit the connector to a box knockout using the provided locknut for a concrete-tight seal. Bridgeport steel EMT compression connectors are available in trade sizes 1/2" to 4". All are UL Listed under File No. E24001 and meet the stringent bonding and grounding requirements of UL 514B.