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The CAMBRIDGE RESOURCES fnb34x3 is a black steel pipe nipple designed for use in threaded piping systems. It measures 0.75 inches in diameter by 3 inches in length and is manufactured from steel to ASTM A733 specifications. This nipple is hydrostatically tested and rated for a maximum of 214 psi at 400 degrees F, making it suitable for demanding gas, water, and steam distribution applications. Plumbers, pipefitters, and HVAC technicians use this fitting to connect or extend threaded pipe runs in both residential and light commercial installations.
This nipple is commonly installed in gas supply lines, heating system piping, and general plumbing distribution. Its black steel construction makes it a standard choice for natural gas and propane supply applications where galvanized fittings are not permitted. The 0.75-inch nominal thread size fits standard NPT connections, and the 3-inch length accommodates close-clearance runs where a longer nipple is not practical.
Designed as an OEM-style replacement or new-installation fitting for threaded black steel piping systems using 0.75-inch NPT connections.
Installation should be performed by a licensed plumber, pipefitter, or qualified HVAC technician in accordance with applicable local codes and the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC) where applicable. Shut off and depressurize the supply line completely before removing or installing any threaded fitting. Apply an approved pipe thread sealant or PTFE tape rated for the intended service before making up the joint. Do not use this fitting beyond its rated pressure or temperature limits.
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