Connect pipes with a leak-resistant seal using the Flexible Elastomeric PVC Coupling for 4 in. X 3 in. Cast Iron/Plastic/Copper/Steel/Lead Pipe. This easy-fit coupling has one 4 in. end and one 3 in. end that slides onto cast iron, plastic, copper, steel, or lead pipe. Clamps on each end of the coupling tighten to secure it in place. Flexible coupling provides a rust-, chemical-, and corrosion-resistant connection that flexes with normal earth movement. Durable coupling is made of flexible elastomeric polyvinyl chloride. Clamp is made from series 300 stainless steel. Product is ICC, CSA, and IAPMO listed.