B K Mueller 521-943HN Black Hex Bushing 3/4x1/2 Inch 25pk

Product Description

The B K Mueller Industries 521-943HN is a black hex bushing designed to reduce a 3/4-inch female pipe thread to a 1/2-inch male pipe thread. This type of fitting is a standard threaded reducer used throughout residential and commercial piping systems, including gas distribution, compressed air lines, and black iron pipe assemblies. The hex profile allows a wrench to seat firmly during installation, providing controlled torque without slipping. Plumbers, pipefitters, and gas line technicians install this fitting during rough-in and service work where pipe size transitions are required at valves, manifolds, or appliance connections.

This black hex bushing is suited for use in black iron pipe systems commonly found in natural gas and propane distribution, as well as industrial and mechanical applications where malleable or black steel fittings are specified. The 3/4-inch to 1/2-inch reduction is one of the most common size transitions in residential gas appliance hookups and light commercial piping. Sold in a package of 25 units, this item is well suited for contractors and service shops that need stock on hand for repeat installations.

Key Features

• Hex body profile allows secure wrench grip during tightening
• Reduces 3/4-inch female thread to 1/2-inch male thread
• Black finish is standard for gas and black iron pipe systems
• Package quantity of 25 units supports bulk stocking and job-lot use
• Threaded fitting design for tool-installed, leak-tested connections

Compatibility

Designed as an OEM-style replacement and standard-stock fitting for black iron threaded pipe systems using 3/4-inch to 1/2-inch NPT connections.

Installation Notes

Installation is performed by licensed plumbers or gas fitters depending on the application and local code requirements. Before installing or replacing any threaded fitting in a gas line, shut off the gas supply at the meter or main valve and verify pressure has been relieved. Apply an approved thread sealant or PTFE tape rated for the service medium before threading the bushing into place. After installation, leak-test all gas connections using an approved bubble solution or electronic leak detector before restoring service.