B K Mueller 521-225HC 1 in Black Merchant Coupling

Product Description

The B K Mueller Industries 521-225HC is a 1-inch black merchant coupling designed for joining threaded pipe sections in black iron piping systems. This fitting provides a standard threaded connection on both ends, allowing plumbers and pipefitters to extend or repair black steel pipe runs in gas, steam, or water distribution applications. The coupling ships in a package quantity of 40 units, making it practical for contractors stocking fittings for multiple jobs. Its black iron finish suits systems where galvanized coatings are not required or specified.

This coupling is used in residential and commercial piping installations where black iron pipe is the material of choice, most commonly in natural gas and propane distribution lines, steam heating systems, and certain industrial fluid-handling applications. Plumbers, pipefitters, and gas fitters install this fitting as part of threaded pipe assemblies. It is appropriate for both new construction and repair work on existing black iron systems.

Key Features

• 1-inch nominal pipe size for compatibility with standard black iron pipe
• Threaded on both ends for straightforward pipe-to-pipe connection
• Black iron finish suited for gas, steam, and water piping systems
• Sold in a package quantity of 40 units for contractor-level supply
• Merchant coupling profile for standard inline pipe joining

Compatibility

Designed as an OEM-style replacement and standard fitting for 1-inch nominal black iron threaded pipe systems used in residential and commercial plumbing and gas piping installations.

Installation Notes

Installation should be performed by a licensed plumber or gas fitter in accordance with applicable local codes, the International Fuel Gas Code (IFGC), or the International Plumbing Code (IPC) as required by the application. Shut off the gas or water supply and verify the system is depressurized before disassembling or modifying any pipe section. Apply an appropriate pipe thread sealant or PTFE tape rated for the service medium before making up threaded connections. Never over-tighten threaded fittings, and inspect all joints for leaks before returning the system to service.