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The ASC Engineered Solutions 4354001650 is a black steel seamless extra heavy (XH) pipe nipple sized at 3/4 inch by 3-1/2 inches. Manufactured to ASTM A106 Grade B standards, this nipple is designed for use in high-pressure and high-temperature piping systems where a standard-weight fitting is not sufficient. The seamless construction eliminates a weld seam, reducing the risk of failure under stress. Plumbers, pipefitters, and mechanical contractors install this type of nipple as a close connection between threaded pipe fittings in industrial, commercial, and mechanical systems.
This nipple is suited for steam, gas, oil, and other high-pressure fluid distribution applications where extra heavy wall thickness is required. The black steel finish makes it appropriate for non-potable water and gas service lines. It is commonly used in commercial mechanical rooms, industrial process piping, and fire suppression systems that require rated, seamless pipe connections. The 3/4-inch by 3-1/2-inch dimension fits standard threaded fittings of matching size and schedule.
Designed as an OEM-style replacement or direct-install fitting for threaded black steel piping systems requiring 3/4-inch extra heavy seamless nipples.
Installation should be performed by a licensed plumber or pipefitter in accordance with applicable mechanical and plumbing codes, including ASME B31.1 or B31.3 where relevant. Shut off and depressurize the system completely before removing or installing any threaded pipe fitting. Apply an appropriate thread sealant or PTFE tape to the male threads before assembly, and tighten to a proper engagement depth using pipe wrenches. Do not over-tighten, as this can crack fittings or damage threads.
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