Bk Mueller 511-385HC Malleable Iron Reducing Coupling 2x1 in

Product Description

The BK MUELLER 511-385HC is a Class 150 malleable iron reducing coupling designed for threaded pipe connections transitioning from 2-inch to 1-inch diameter. This galvanized fitting handles liquid and gas service at up to 300 psi and steam service at up to 150 psi. Malleable iron construction provides the ductility needed to withstand mechanical stress and vibration in working piping systems. Licensed plumbers and pipefitters install this coupling where pipe sizing must step down within a distribution run, whether in commercial mechanical rooms, industrial process lines, or residential utility applications.

This reducing coupling is suited for gas distribution piping, hydronic heating systems, compressed air lines, and other liquid or steam systems that fall within the rated pressure limits. The threaded end connection conforms to standard NPT fitting practices, making it compatible with common pipe wrenches and pipe thread sealants. It carries a galvanized finish to provide corrosion resistance in exposed or damp installation environments.

Key Features

• Reducing coupling steps down from 2-inch to 1-inch pipe in a single threaded fitting
• 300 psi liquid and gas pressure rating for demanding service conditions
• 150 psi steam pressure rating for steam distribution piping
• Class 150 malleable iron construction offers strength with resistance to impact and vibration
• Galvanized finish provides corrosion resistance in exposed or moisture-prone environments
• Threaded NPT end connections for standard wrench installation without special tooling

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 2-inch by 1-inch NPT threaded pipe systems operating within Class 150 pressure and temperature limits for liquid, gas, or steam service.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable plumbing and mechanical codes, including the IPC and IFGC where relevant. Depressurize and isolate the affected pipe section fully before removing any existing fittings or installing this coupling. Apply an approved pipe thread sealant or PTFE tape to the male threads before assembly, and tighten to snug with a pipe wrench - avoid over-tightening, which can crack threaded fittings. For gas service, verify all joints with an approved leak-detection solution after restoring pressure.