Fernco 4"x2" Flexible Reducing Coupling with 2 Stainless Steel Clamps. It is designed for connecting cast iron or plastic pipes to cast iron or plastic pipes, offering a reliable and versatile solution for your plumbing needs. Made from durable materials, this coupling is corrosion-resistant, flexible, lead-free, removable, UV-resistant, underground-rated, and suitable for underground use. It has a maximum working pressure of 4.3 psi, a maximum working temperature of 120 degrees Fahrenheit, and is backed by a 1-year warranty.