Columbia-MBF presents Galvanized Rigid Steel Conduit (GRC) Elbows. GRC Elbows are interchangeable with IMC and Rigid (GRC) Steel Conduits and Kwik-Couple Conduits. Elbows are Certified to Canadian Standards Association Safety Standard CSA C22.2 No.45.1 and manufactured in accordance with ANSI C80.1.