Bk Mueller 511-387HN Malleable Iron Reducing Coupling 2x1.5 in

Product Description

The BK MUELLER 511-387HN is a malleable iron reducing coupling designed to connect a 2-inch pipe to a 1-1/2-inch pipe in threaded piping systems. Rated at 300 psi for liquid and gas service and 150 psi for steam, this Class 150 fitting handles demanding pressure requirements across a range of plumbing and mechanical applications. The galvanized finish provides corrosion resistance for long service life in both wet and dry environments. Plumbers and pipefitters install this coupling where pipe diameter transitions are required in supply, distribution, or process lines.

This reducing coupling is suited for residential and light commercial plumbing, HVAC hydronic piping, gas distribution lines, and steam systems operating within the rated pressure limits. The threaded end connections conform to standard NPT threading, making installation straightforward in existing threaded piping assemblies. It is appropriate for liquid, gas, and low-pressure steam service where a concentric reduction from 2 inches to 1-1/2 inches is needed.

Key Features

• 300 psi liquid and gas pressure rating for reliable service in pressurized systems
• 150 psi steam pressure rating suitable for low-pressure steam distribution
• Malleable iron construction provides strength and resistance to mechanical stress
• Galvanized finish resists corrosion in wet and exposed environments
• Threaded NPT end connections for compatibility with standard threaded pipe assemblies
• Class 150 fitting meets common industry standards for pipe fittings

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 2-inch to 1-1/2-inch threaded malleable iron piping systems used in plumbing, gas, and steam applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable codes such as the International Plumbing Code or International Fuel Gas Code. Shut off and depressurize the piping system completely before removing or installing any fittings. Apply an appropriate thread sealant or PTFE tape to all male threads prior to assembly. Do not exceed the rated pressure limits for the intended service type.