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Introducing the new Turn-Tite Mechanical Expansion Plug from Shaw Plugs - the ideal solution for your expansion, pressure relief, and freeze protection needs in hydronic heating systems, water distribution networks, and chemical processing plants. Made in the USA, this 1-1/8 nominal size plug is easy to install and remove without damaging pipes thanks to its corrosion-resistant brass construction. With a minimum diameter of 1.06 and a maximum diameter of 1.166, it's perfect for use in applications where space is tight. The Turn-Tite design ensures a secure seal, preventing leaks and maintaining pressure levels. Use this versatile plug to control expansion, reduce backpressure, and protect against freezing - all while enjoying the peace of mind that comes with its durable, American-made construction.