Product Description 4 inch x 2 inch flexible reducing coupling with 2 stainless steel clamps, connects cast iron or plastic to cast iron or plastic. This product is highly durable. This product is easy to use. This product is manufactured in china. From the Manufacturer Fernco Flexible Couplings have found wide acceptance among sewer and plumbing contractors and municipalities because of their quality and ease of installation. Fernco couplings are used for all types of in-house and sewer connections: drain, waste, vent piping, house-to-main, repairs, cut- ins, conductor, roof drains and increasers-reducers.