Bk Mueller 520-787HC Black Iron Reducer 2 X 1.5 in Threaded

Product Description

The BK MUELLER 520-787HC is a black malleable iron reducer fitting designed to connect pipe runs of differing diameters in threaded piping systems. It transitions from a 2-inch female threaded inlet to a 1.5-inch female threaded outlet and carries a Class 150 fitting classification with a liquid and gas pressure rating of 300 psi. The black finish is standard for gas piping applications. This type of fitting is installed by licensed plumbers and pipefitters working on low-pressure gas distribution, compressed air lines, and other compatible fluid systems.

This reducer is suited for residential and light commercial installations where a threaded piping system requires a concentric diameter reduction. Common applications include natural gas supply lines, propane distribution, and compressed air headers where pipe size changes are needed at a branch or riser. The threaded end connections allow for tool-based installation without welding or special tooling beyond pipe wrenches and thread sealant.

Key Features

• Malleable iron construction provides strength and resistance to mechanical stress in threaded assemblies
• Black finish makes this fitting appropriate for gas service piping where black iron is the standard material
• Class 150 rated with a 300 psi liquid and gas pressure rating
• Female threaded on both ends for straightforward installation with standard pipe thread (NPT) tooling
• Reduces from 2 inches to 1.5 inches to accommodate piping transitions

Compatibility

Designed as an OEM-style replacement or new-installation fitting for threaded malleable iron piping systems rated at Class 150 or lower pressure service.

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 required. Shut off all gas or fluid supply and verify zero pressure in the line before removing or installing any fitting. Apply an approved pipe thread sealant or PTFE tape rated for the service medium to all threaded connections. Inspect threads for damage before assembly and do not over-torque, as malleable iron threads can be damaged by excessive force.