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The ASC Engineered Solutions 818908899 is a black malleable iron threaded bushing designed to reduce pipe connections from a 4-inch female thread to a 2-inch male thread. This hex bushing style fitting is used to transition between two different pipe sizes within a threaded piping system. The black coating provides corrosion resistance suitable for gas, air, and non-potable fluid applications. It is installed by licensed plumbers, pipefitters, and HVAC technicians working on low-pressure pipe assemblies. The fitting weighs 2.91 pounds and is manufactured as an import product.
This bushing is used in residential and commercial piping systems where a threaded size reduction is needed at a fitting, valve, or equipment connection. Common install scenarios include gas distribution headers, compressed air systems, and mechanical room piping where a 4-inch line steps down to a 2-inch branch or equipment port. The black finish distinguishes it from galvanized fittings and is standard for gas piping in many jurisdictions.
Designed as an OEM-style replacement or new-installation fitting for standard NPT threaded pipe systems requiring a 4-inch to 2-inch reduction.
This fitting is installed by licensed plumbers or pipefitters following applicable codes such as the IPC or IFGC depending on the service medium. Apply an appropriate thread sealant or PTFE tape to male threads before assembly. Use a pipe wrench on the hex body to tighten; do not over-torque malleable iron fittings. Shut off and depressurize the line before removing or replacing any threaded fitting in an existing system.
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