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The MSI PRODUCTS INC A2050116 is a 1-inch 150 LB malleable iron square head solid plug designed to close female-threaded pipe openings in pressurized systems. Rated for 150 to 300 psi service, it provides a secure, leak-resistant seal for system termination, pressure testing, or capping maintenance access points. The solid construction delivers added mechanical strength over hollow designs, and the square head profile accepts standard wrenches for straightforward installation and removal. Manufactured to ASME B16.3 dimensional standards, ASTM A197 material specifications, and ASME B1.20.1 threading requirements, this plug is built for consistent fit and dependable performance in daily trade use. Full lot traceability and material test reports are available to support quality assurance and compliance documentation.
This plug is suited for residential and light commercial plumbing, HVAC hydronic piping, gas distribution systems, and industrial piping applications where a threaded female opening must be sealed temporarily or permanently. The black finish is standard for 150 LB malleable iron fittings in pipe systems assembled with NPT threading. Licensed plumbers, pipefitters, and HVAC technicians working with schedule pipe and malleable iron fittings will find this plug fits directly into standard 1-inch female NPT connections without modification.
Designed as an OEM-style replacement and standard fitting for 1-inch female NPT threaded pipe connections in 150 LB malleable iron piping systems.
Installation and removal should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and ASME standards. Depressurize and isolate the pipe section completely before removing or installing any threaded plug. Apply an approved pipe thread sealant or PTFE tape to the male threads before installation to ensure a leak-free seal. Do not over-tighten; use a torque appropriate for malleable iron fittings as specified by applicable project or code requirements.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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