1" Transition Steel Xpoly Georg Fischer Central Plastics is known as North America's leader in designing and manufacturing piping systems.We specialize in HDPE fittings and pipe but also work in metals, making us the industry leader in transition fittings.Our time-tested products ensure leak-free durable piping systems from end to end.We’ve been in the piping connection business for nearly 60 years, developing quality, innovative products to meet the ever-changing needs of the piping industry.Along the way we have developed new products, many becoming the industry standards, including transition fittings.