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The ASC ENGINEERED SOLUTIONS 318900081 is a black steel pipe cap designed to close off the end of a 3/8-inch threaded pipe. It provides a secure, pressure-rated termination point in gas, air, or fluid piping systems where a line needs to be capped, plugged, or temporarily closed. The cap is constructed from black steel, making it suitable for use in gas distribution and similar applications where corrosion resistance from the pipe coating is a factor. Plumbers, pipefitters, and HVAC technicians install this fitting as part of roughing-in work, system testing, and permanent line terminations.
This cap is commonly used in residential and light commercial piping systems. Typical applications include capping unused branch outlets on gas supply lines, closing off pipe ends during pressure testing, and sealing off decommissioned service lines. Its 3/8-inch size fits standard NPT threaded pipe of the same nominal diameter.
Designed as an OEM-style replacement fitting for use with 3/8-inch black steel threaded pipe systems in residential and commercial applications.
Installation is performed by licensed plumbers or pipefitters in accordance with applicable mechanical and gas codes such as the IFGC and IPC. Shut off and depressurize the line before installation. Apply appropriate thread sealant or PTFE tape to male threads before threading on the cap, and tighten with a pipe wrench to a proper fit without over-stressing the fitting. Pressure-test the completed assembly per local code requirements before returning the system to service.
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