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The BMI USA 4022 is a lead-free brass threaded nipple designed for use in plumbing distribution systems where code-compliant, potable-water-safe fittings are required. Measuring 4 inches in diameter with a 3.5-inch length, this nipple is constructed from solid brass with a red finish, providing reliable corrosion resistance in both hot and cold water supply lines. At 3.31 pounds, the fitting offers substantial wall thickness appropriate for commercial and residential threaded piping assemblies. Licensed plumbers and pipefitters install this type of nipple as a standard connection between valves, fixtures, and pipe sections in threaded systems.
This nipple is suited for residential and light commercial plumbing applications where lead-free compliance is mandated by local codes, including installations governed by the Safe Drinking Water Act requirements. It is commonly used in water supply distribution lines, boiler connections, and general threaded pipe assemblies. The 4 x 3.5-inch configuration is a widely used close-to-extension nipple size in commercial mechanical rooms and residential rough-in work.
Designed as an OEM-style replacement and standard-use brass threaded nipple for residential and commercial plumbing systems utilizing NPT threaded pipe connections.
Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC guidelines. Shut off the water supply and relieve system pressure before removing or installing any threaded fitting. Apply thread sealant tape or pipe compound to the male threads before assembly and tighten to hand-snug plus wrench turns appropriate for brass fittings — avoid over-tightening, which can crack brass. Inspect threads for damage before installation.
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