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    This year marks the 60th anniversary of Amtrol's invention of the diaphragm expansion tank. This innovative new product not only controlled system pressure in heating and chilled water systems, it also helped to significantly reduce energy consumption. Today Extrol is still the world's leading expansion tank and still Made in the USA.

    In many ways the Extrol was The One That Started It All for Amtrol. It was our first major product breakthrough and it set the tone for the many innovations that followed.

    All of us at Amtrol are proud of Extrol's success over the past 60 years. More importantly, we look forward to the future with confidence and enthusiasm because our commitment to building the best expansion tanks in the world is stronger than ever.

    Copyright 2014 AMTROL Inc. All rights reserved.