B K Mueller 521-975HC Black Hex Bushing 1.5x1 Inch

Product Description

The B K Mueller Industries 521-975HC is a black hex bushing designed to reduce pipe thread sizes in iron pipe systems. This fitting transitions a 1.5-inch female NPT opening down to a 1-inch male NPT connection. The hex body provides a flat wrench surface for proper torque during installation. Finished in black iron, this bushing is suited for gas piping, compressed air lines, and similar low-pressure piping applications. Licensed plumbers and pipefitters install these fittings as part of threaded iron pipe assemblies in both residential and light commercial settings. The package contains 10 units sold as a set.

This hex bushing is used in threaded black iron pipe systems where a pipe size reduction is needed at a fitting, valve, or appliance connection. Common install scenarios include gas appliance drops, air compressor manifolds, and industrial piping headers where 1.5-inch to 1-inch transitions are required. The hex body allows standard pipe wrenches or adjustable wrenches to seat the fitting fully without slipping. The black iron finish is compatible with standard black pipe in gas distribution systems.

Key Features

• Reduces 1.5-inch female NPT to 1-inch male NPT in a single fitting
• Hex body provides secure wrench engagement for proper installation
• Black iron finish matches standard black iron pipe systems
• Sold in a 10-unit package for job-lot or multi-point installs
• Package weight of 4.51 pounds for the 10-unit set

Compatibility

Designed as an OEM-style replacement fitting for standard NPT threaded black iron pipe systems in gas, air, and compatible fluid piping applications.

Installation Notes

Installation is performed by a licensed plumber or pipefitter in accordance with applicable local codes and IFGC requirements for gas piping applications. Shut off and depressurize the line before installing or replacing any threaded fitting. Apply approved thread sealant or PTFE tape rated for the intended service to male threads before assembly. Do not over-torque the fitting; use the hex body with a proper pipe wrench to achieve a leak-free connection without cracking the fitting.