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The B K/MUELLER INDS(IMPORT) 511-385HC is a galvanized steel reducing coupling designed for joining threaded pipe sections of two different diameters. It transitions from a 2-inch female thread on one end to a 1-inch female thread on the other, making it a practical fitting for reducing pipe runs in water supply, gas distribution, and general plumbing systems. Licensed plumbers and pipefitters install this type of fitting where a pipe run must step down in size. The galvanized coating provides corrosion resistance suitable for exposed or moderately wet environments.
This reducing coupling is used in residential and light commercial plumbing installations where galvanized steel pipe is the specified material. Common applications include water supply lines, drain and vent systems using galvanized pipe, and threaded pipe assemblies in mechanical rooms. It is sold in a package quantity of 5 units per order, making it practical for jobs requiring multiple fittings of the same size.
Designed as an OEM-style replacement fitting for standard NPT-threaded galvanized steel pipe systems requiring a 2-inch to 1-inch reducing coupling.
Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the International Plumbing Code (IPC). Shut off and depressurize the water or gas supply before removing any existing fittings. Use pipe thread sealant or PTFE tape on all male threads before assembly. Do not overtighten threaded connections, as this can crack fittings or damage threads.
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