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The ASC ENGINEERED SOLUTIONS 8700131850 is a 4-inch by 3-inch galvanized hex bushing rated for 150-class service. Hex bushings are threaded fittings used to reduce from a larger pipe thread to a smaller pipe thread within the same fitting body, eliminating the need for a separate coupling and reducer combination. This domestic-made fitting is constructed with galvanized steel, making it suitable for water, gas, and general-purpose plumbing and mechanical piping systems. Plumbers and pipefitters install this type of fitting wherever a male-to-female NPT thread reduction is required in a low-pressure iron or steel pipe assembly.
This hex bushing is suited for residential and light commercial plumbing, HVAC hydronic systems, fire protection piping, and general mechanical installations where a 4-inch male NPT thread must transition down to a 3-inch female NPT thread. The 150-class pressure rating aligns with standard Schedule 40 iron pipe service conditions. Domestic manufacture supports projects with buy-American or domestic-content requirements.
Designed as an OEM-style replacement or new-installation fitting for 4-inch by 3-inch NPT threaded iron and steel pipe systems rated at 150 class.
Installation is performed by licensed plumbers or pipefitters following applicable IPC and IFGC requirements for threaded pipe assemblies. Shut off and depressurize the pipe system completely before removing or installing any threaded fitting. Apply an appropriate thread sealant or PTFE tape to the male threads before engagement. Use a pipe wrench on the hex body to tighten to a snug, leak-free joint without over-torquing the fitting.
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