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The BMI USA 4640 is a lead-free brass threaded nipple measuring 4 inches in length. Nipples are short sections of externally threaded pipe used to connect two female-threaded fittings, valves, or equipment ports. This 1x4 nipple is machined from brass, which provides corrosion resistance and reliable sealing performance in potable water and general plumbing applications. Its lead-free construction meets requirements for use in drinking water systems. Plumbers and pipefitters install this type of fitting during new construction, system repairs, or equipment replacements where a short rigid pipe extension is needed between threaded components.
This brass nipple is suited for residential and light commercial plumbing systems. It is commonly used in water supply lines, boiler connections, water heater installations, and general pipe assemblies where a 1-inch nominal threaded nipple at 4 inches in length is required. The red finish is characteristic of BMI brass nipple products and aids in identification on the shelf or job site.
Designed as a standard 1-inch nominal threaded brass nipple for use with compatible female-threaded fittings, valves, and equipment in residential and commercial plumbing systems.
Installation is performed by licensed plumbers or qualified pipefitters. Shut off the water supply and depressurize the line before threading any fittings. Apply thread sealant tape or pipe dope rated for the intended service to the external threads before making up the connection. Follow applicable local plumbing codes and IPC guidelines for threaded joint assembly and torque practices.
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