Bk Mueller 521-385HC Reducing Coupling 2x1 in Threaded

Product Description

The BK MUELLER 521-385HC is a black malleable iron reducing coupling designed for threaded pipe assemblies in gas and liquid piping systems. It connects a 2-inch pipe to a 1-inch pipe using female iron pipe (FIP) threads on both ends. Rated at Class 150 with a pressure rating of 300 psi, this fitting handles demanding service conditions in both residential and light commercial installations. The black finish is standard for gas piping applications. Plumbers and pipefitters install this coupling where a reduction in pipe diameter is required within a threaded iron pipe system.

This reducing coupling is suited for use in natural gas, propane, water, and air distribution systems where malleable iron fittings are specified. It is commonly installed in residential gas lines, commercial gas distribution headers, and industrial piping networks that require a step-down from 2-inch to 1-inch pipe. The threaded FIP connection allows installation using standard pipe wrenches without special tooling, making it a straightforward field fit for service and retrofit work.

Key Features

• Malleable iron construction provides strength and impact resistance in threaded piping systems
• Black finish meets standard requirements for gas piping applications
• FIP threads on both ends for connection to standard NPT male-threaded pipe
• 300 psi pressure rating suitable for gas and liquid service
• Class 150 classification for use in standard commercial and residential piping
• Reduces from 2-inch to 1-inch pipe in a single fitting

Compatibility

Designed as an OEM-style replacement and standard-stock reducing coupling for malleable iron threaded pipe systems using NPT connections in Class 150 service.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable code requirements such as the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC). Shut off and depressurize the pipeline completely before removing or installing any fitting. Apply listed pipe thread sealant or tape rated for the service medium to all male threads before assembly. Do not overtighten with pipe wrenches, as malleable iron threads can be damaged by excessive force.