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The ASC Engineered Solutions 310539606 is a 2-inch extra-heavy black malleable iron coupling designed for threaded pipe connections in demanding mechanical and plumbing systems. This fitting joins two sections of threaded pipe in a straight run, providing a secure, pressure-rated connection suited to high-stress piping applications. The extra-heavy (XH) wall designation indicates greater material thickness compared to standard couplings, making it appropriate for systems that operate under elevated pressure or require additional structural integrity. Licensed plumbers and pipefitters are the primary installers of this fitting.
This coupling is used in commercial and industrial piping systems where black malleable iron fittings are specified, including steam, gas distribution, and fire suppression lines. The black finish indicates the absence of galvanizing, which is the standard specification for gas piping and steam systems where galvanized coatings are not permitted. Its extra-heavy wall construction makes it well suited to retrofit and new-construction applications where elevated service demands require heavier fittings than standard weight allows.
Designed as an OEM-style replacement and standard-service fitting for 2-inch threaded black malleable iron piping systems using NPT-threaded connections.
Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and IFGC or IPC requirements for the system type. Shut off and depressurize the pipe system completely before removing or installing any fitting. Apply thread sealant or PTFE tape rated for the intended service medium before making up the joint. Do not over-tighten threaded connections, as malleable iron fittings can crack under excessive torque applied with power tools.
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