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The Watts Dielectric Union 3/4 For Pipe Size FNPT is a versatile fitting designed to connect pipes made from dissimilar metals, preventing corrosion and deterioration that can accelerate with direct contact. It's ideal for use in air and water conditioners, hot water storage tanks, processing tanks, and steam, gas, and water piping. The union nut, 2 tailpieces, and gasket are included for easy installation. Its durable malleable iron construction ensures long-lasting performance even under high pressure up to 250 PSI. Whether you're a professional plumber or DIY enthusiast, this dielectric union is an essential tool for any job that involves connecting dissimilar metals securely and safely.