Marinco PBG plug features: Uses the exclusive Perma-Lock Terminal; Internal cord clamp provides superior strain relief; Close-in wire entrance holes and generous wiring space make it easy to wire; Two assembly screws for fast assembly; Terminals are open, ready to wire for quickest assembly; Dust seal keeps contaminants out of wiring chamber; Redundant-terminal markings allow for quickest, easiest assembly; All nylon construction for durability.