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The ASC ENGINEERED SOLUTIONS 318902566 is a 2-inch black steel cored square head plug designed to close off threaded pipe ends in plumbing, gas, and mechanical piping systems. The cored design means the center is not fully solid, which reduces weight while maintaining the structural integrity needed for a secure threaded seal. The square drive head allows installation and removal with standard pipe wrenches or socket tools. At 0.89 pounds, this is a durable, full-metal fitting suited for professional pipe work in both new construction and service applications.
This square head plug is used across residential and commercial piping installations where a threaded male plug is needed to cap a female-threaded fitting or pipe end. Common applications include gas line capping, hydronic heating systems, steam lines, and general industrial plumbing. Licensed plumbers, pipefitters, and mechanical contractors are the primary installers. The black steel construction makes it appropriate for natural gas and propane systems where malleable iron or black steel fittings are specified.
Designed as an OEM-style replacement or new-installation fitting for 2-inch female NPT threaded pipe ends in black steel or malleable iron piping systems.
Installation should be performed by a licensed plumber or pipefitter following applicable IPC or IFGC codes for the system type. Apply an approved pipe thread sealant or PTFE tape to the male threads before installation. Ensure the system is fully depressurized and isolated before removing or installing any pipe plug. Do not use on systems that exceed the pressure or temperature rating of black steel threaded fittings as specified by the applicable code or system design.
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