Bk Mueller 521-387HC Black Reducing Coupling 2x1.5in Threaded

Product Description

The BK MUELLER 521-387HC is a black malleable iron reducing coupling designed for threaded pipe connections in gas and liquid distribution systems. It transitions from a 2-inch pipe to a 1.5-inch pipe using standard NPT threads, making it a practical fitting for reducing flow line diameter in a single connection. Rated at Class 150 with a 300 psi pressure rating, this coupling handles the demands of commercial and residential piping systems. The black finish is standard for gas piping applications. Plumbers and pipefitters are the primary installers of this fitting.

This reducing coupling is suited for use in residential and light commercial piping systems carrying gas or liquid. It is commonly installed in gas distribution lines, water supply systems, and industrial process piping where a threaded pipe size reduction is required. The 2 x 1.5-inch configuration is a frequently encountered size change in branch line and header assemblies. Its malleable iron construction provides the ductility needed to withstand vibration and mechanical stress in service.

Key Features

• Reduces from 2-inch to 1.5-inch pipe via threaded NPT connections
• Malleable iron construction provides durability and impact resistance
• Black finish suited for gas piping applications per standard trade practice
• Class 150 rated with a 300 psi liquid and gas pressure rating
• Single-piece reducing coupling eliminates need for a separate bushing

Compatibility

Designed as an OEM-style replacement or new-installation fitting for threaded malleable iron pipe systems sized at 2 x 1.5 inches, conforming to Class 150 standards.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC) as appropriate. Shut off gas or water supply and depressurize the line before beginning work. Apply thread sealant or PTFE tape rated for the intended service medium before making up threaded connections. Do not over-tighten; use a pipe wrench with a backup wrench on the adjoining fitting to avoid stressing connected piping.