4“ compression couplings are used in dry locations to connect the ends of two 4” unthreaded rigid or IMC conduits together. Steel compression couplings provide concrete tight connections. Garvin Industries’ heavy gauge steel construction maintains mechanical protection and solid grounding of one conduit to another. These couplings eliminate the need to thread bald conduits to couple them together. Compression couplings are zinc electroplated for excellent corrosion protection in damp locations.