Mighty-Merge Two-to-One EMT couplings are designed to save users time and material when joining two lengths of EMT conduit into one. The cULus-listed fittings are suitable in applications where: ...

Article 358 covers the use, installation, and construction specifications for EMT and associated fittings. As noted in Sec. 358.42, "Couplings and connectors used with EMT shall be made up tight.