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The ASC Engineered Solutions 8700159406 is a 1-1/4 inch malleable black iron square head pipe plug designed to seal threaded pipe openings in plumbing, HVAC piping, and general industrial piping systems. The hollow core design keeps weight low while maintaining the structural integrity expected from malleable iron fittings. This plug is manufactured to meet Federal Specification WW-P-471-B, ANSI B-16.14 for dimensions, and ANSI B-2.1 for pipe threads, making it a code-compliant choice for journeymen plumbers, pipefitters, and mechanical contractors working on ferrous piping assemblies.
This plug is suited for residential and commercial piping applications where a threaded pipe end must be closed off cleanly and permanently. Typical use cases include capping unused branch outlets on gas, water, or steam distribution systems and sealing test ports after pressure testing. The square head drive allows installation and removal with a standard wrench, which is common practice in tight mechanical spaces where specialized tooling is impractical.
Designed as an OEM-style replacement and standard-stock fitting for 1-1/4 inch NPT threaded ferrous pipe systems in plumbing, mechanical, and HVAC piping applications.
Installation is performed by licensed plumbers or pipefitters in accordance with applicable mechanical and plumbing codes. Shut off and depressurize the piping system completely before installing or removing any threaded plug. Apply an appropriate thread sealant or PTFE tape to the male threads before installation to ensure a leak-free seal. Do not overtighten malleable iron fittings, as the material can crack under excessive torque.
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