PECO 312ST, 1", Steel, Concrete Tight, Set Screw, EMT Conduit Coupling, 1pc. PECO 314ST, 1-1/2", Znc Plated STL, Concrete Tight, Set Screw, EMT Con Cplg, 1pc. We have new products in manufacturer boxes, as well as loose and shelf-worn quality products to save you even more money.