B K/mueller Inds(import) 521-386HN Black Reducing Coupling

Product Description

The B K/MUELLER INDS(IMPORT) 521-386HN is a black reducing coupling designed to connect two pipes of different diameters in a threaded piping system. It transitions from a 2-inch connection on one end to a 1-1/4-inch connection on the other, allowing piping runs to step down in size without additional fittings. This type of coupling is standard in gas distribution, industrial piping, and black iron pipe systems. Licensed plumbers and pipefitters install these fittings as part of routine pipe assembly, system repairs, or diameter transitions in both residential and light commercial applications.

The 521-386HN is suited for black iron pipe systems commonly found in natural gas supply lines, propane distribution, and certain industrial fluid conveyance applications. The 2-inch to 1-1/4-inch reducing configuration handles branch transitions or end-of-run reductions where flow demand steps down. It ships in a package quantity of four units, making it practical for contractors completing multi-point installations or stocking service vehicles.

Key Features

• Reducing configuration transitions from 2 inches to 1-1/4 inches in a single fitting
• Black finish consistent with standard black iron pipe fittings used in gas and industrial piping
• Packaged in quantities of four units per package for multi-fitting jobs
• Threaded coupling design compatible with standard threaded black iron pipe assemblies

Compatibility

Designed as an OEM-style replacement or standard-stock fitting for threaded black iron pipe systems requiring a 2-inch to 1-1/4-inch reducing connection.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, including IFGC requirements for gas piping systems. Shut off and depressurize the piping system fully before disassembling existing fittings or installing new ones. Apply appropriate thread sealant or PTFE tape rated for the intended service medium to all threaded connections before assembly. Do not overtighten threaded fittings, as this can damage threads and compromise the seal.