20A GFCI WORKS WITH THE EXISTING THREE-WIRE PLUGTAIL CONNECTORS CREATING A NON-FEED THRU APPLICATION FOR FACILITY OWNERS. AT ROUGH-IN, JUST" STALL THE SAME RIGHT-ANGLE CONNECTOR FOR GFCI AND RECEPTACLE OPENING.PLUGTAIL‚ DEVICES AND CONNECTORS MEAN THAT DEVICE" STALLATION IS THE SAME REGARDLESS OF SKILL LEVEL OF THE" STALLER. THE UL-LISTED CONNECTORS ARE KEYED TO ENSURE PROPER WIRING" STALLATION" TO EACH RECEPTACLE.