Fernco 5 In. x 5 In. flexible PVC Coupling manufactured for Drain, Waste and Vent pipes. This model fits 5 In. cast iron, plastic, steel, copper and lead pipe to 5 In. cast iron, plastic, steel, copper and lead pipe. It features durable construction that's designed to be unaffected by soil conditions and seals against infiltration and exfiltration. The band slots offer great flexibility and the coupling includes 300-series stainless-steel clamps that are corrosion-resistant.