Education and Communications What is an Erickson Coupling used for? What is an Erickson Coupling used for? Erickson® 3-piece couplings are used to couple conduit ends when the conduit cannot be turned. Coupling is copper-free aluminum and is used with 1 inch rigid metal conduit and IMC conduit. Coupling is UL listed, CSA certified and concrete-tight. Related Posts:Concrete Calculator - How much concrete do I need?How much does a concrete slab cost per foot?PDF Average Weight (psf) of Completed Walls using Concrete. Material WeightsDensity Of Concrete - How Much Does Concrete weigh?Nominal Weight of Standard Concrete...What is used to attach this conduit to electrical boxes?