Streamline is the best known, most trusted name in the piping systems industry-with a nearly 100-year history of providing the best-in-class products for plumbing and HVAC/R applications. Streamline STL-G Carbon Steel Press Fittings have been engineered with industry-leading technologies and intelligent design elements to provide unmatched joint integrity, optimum system flow, and provides installers with a new level of system performance as well as reliability. These proprietary innovations make Streamline the superior Carbon Steel joining solution for your system. Streamline STL-G Carbon Steel Press Fittings are designed for use in gas and fuel/oil piping systems utilizing Schedule 10-to Schedule 40-carbon steel pipe.