Uny Union, Explosion-Proof/Dust/Ignition-Proof, Trade Size: 2-1/2", Dimensions: 4.88" Outside Diameter, 4.81" Length, Flexibility: Rigid and IMC, Material: Copper-Free Aluminum, Connection: Male Threaded x Female Threaded, Finish: Natural, Used to Connect and Join Conduit to Enclosures without Turning or Removal of Conduit.