B K/mueller Inds(import) 511-386HN Galvanized Coupling

Product Description

The B K/MUELLER INDS(IMPORT) 511-386HN is a galvanized steel reducing coupling designed to connect pipe runs of two different diameters within a threaded piping system. It transitions from a 2-inch female thread on one end to a 1-1/4-inch female thread on the other, allowing plumbers and pipefitters to reduce line size without additional fittings. The galvanized finish provides a zinc-based corrosion barrier suited for water supply, hydronic, and general plumbing applications. This coupling ships in a package quantity of five units, making it practical for commercial rough-in and multi-fixture installations.

This reducing coupling is used in residential and commercial plumbing systems where a threaded pipe run changes diameter. Typical applications include water distribution headers, branch-line reductions, and hydronic heating supply and return piping. Licensed plumbers and pipefitters handle this fitting during new construction and retrofit work. It is also commonly used in industrial pipe assemblies requiring a galvanized finish for corrosion resistance in moderately aggressive environments.

Key Features

• Galvanized finish delivers zinc-based corrosion resistance for water and general plumbing service
• Reducing configuration transitions from 2-inch to 1-1/4-inch female threaded connections
• Threaded ends accept standard NPT pipe for straightforward assembly with common hand tools
• Sold in a package of five units to support multi-connection installations

Compatibility

Designed as an OEM-style replacement or standard-service fitting for threaded galvanized pipe systems using NPT connections in residential and commercial plumbing applications.

Installation Notes

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 supply before removing any existing fittings. Apply thread sealant tape or compound to male threads before assembly and tighten to a snug, leak-free fit using pipe wrenches — do not overtighten, as galvanized fittings can crack under excessive force. Inspect for leaks after restoring pressure to the system.