Overview Reviews Product Description Bridgeport MGB300 Conduit Bushing Material: Malleable Iron Size: 3 Inch Grounding. Product Videos Custom Field Size 3 Material Iron Product Reviews Write a Review Write a Review × Bridgeport Bridgeport MGB300 Conduit Bushing Material: Malleable Iron Size: 3 Inch Grounding Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *