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The BMI USA 35111 is a 3-inch black malleable iron pipe union designed for joining and disconnecting threaded pipe sections in mechanical piping systems. Malleable iron construction provides the strength and durability required for gas, steam, and water distribution lines in both residential and commercial applications. The black finish indicates this union has not been galvanized, making it a standard choice for gas piping and similar services. Licensed plumbers and pipefitters install this fitting as part of routine service connections where future disconnection may be required.
This pipe union is suited for use in gas supply lines, steam systems, and water distribution piping where a threaded, separable joint is needed. Its 3-inch size fits larger-diameter pipe runs typical of commercial mechanical rooms, boiler rooms, and industrial process piping. It is also used in residential applications where main gas lines or large water service lines require a serviceable connection point.
Designed as an OEM-style replacement or new-installation fitting for 3-inch threaded malleable iron piping systems.
Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, including the International Plumbing Code or International Fuel Gas Code as relevant to the service type. Shut off all gas or water supply and relieve system pressure before removing or installing any union fitting. Use an appropriate pipe thread sealant or tape rated for the intended service medium. Do not over-tighten the union nut, as this can distort the seats and cause leaks.
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