The 1.660" INSR SDR 11 BLACK from Dresser Industries is a premium insert fitting designed for SDR 11 piping systems. This black fitting is made from high-density polyethylene, offering excellent chemical resistance and durability. With a size of 1.660", it is compatible with various applications, including water distribution and irrigation systems. The insert design ensures a secure connection, minimizing leaks and enhancing system efficiency. This fitting meets industry standards for performance and safety, making it a reliable choice for both residential and commercial projects.