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Product Description Fits cast iron, copper, steel or lead pipe. Extra length for 90? connection. NOTE: Not recommended for underground connections. For drain waste and vent use only. Do not use in pressure applications. Adapts to other pipe sizes with Qwik Bushings. 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.