The Fernco Proflex 3006-43 Shielded Pipe Coupling is engineered for dependable above-ground pipe transitions between 4'' copper to 3'' cast iron pipe. Featuring a flexible neoprene sleeve and a durable stainless steel shield, this coupling delivers a secure, leak-resistant seal that absorbs vibration and resists shear forces. Whether you're performing a repair or adapting between materials, the Proflex coupling ensures a code-compliant, professional-grade connection that installs quickly with standard tools. Manufactured in the USA, Proflex couplings are trusted by professionals for their quality, reliability, and performance across residential and commercial plumbing applications.