S M I, established in 1993, manufactures three general types of COPPER FITTINGS: Wrot Pressure, Wrot Drainage, and Flanges produced to meet requirements of applicable standards wherever practicable. We have developed and manufacture Extruded High-Finned Tubes. Our High Fin Tube is an integral extended surface tube designed primarily for applications which require high outside-to-inside surface area ratios, such as direct-fire water heaters, boilers, and applications for heating or cooling gases.