B K Mueller 521-226HC 1-1/4 in Black Merchant Coupling

Product Description

The B K Mueller Industries 521-226HC is a 1-1/4 inch black merchant coupling designed for joining sections of black steel pipe in gas, industrial, and mechanical piping systems. This threaded coupling provides a reliable, pressure-rated connection between two pipe ends of equal diameter. The black finish is standard for gas distribution and non-potable piping applications where galvanized or chrome finishes are not required. Licensed plumbers, pipefitters, and gas fitters install this type of fitting in both residential and light commercial work. The package quantity is 16 units per pack, making it practical for service trucks, supply houses, and job-site replenishment.

This merchant coupling is suited for black iron pipe systems commonly found in natural gas supply lines, propane distribution, compressed air, and mechanical heating applications. The 1-1/4 inch size is a commonly specified diameter in residential gas mains and commercial branch lines. It is installed wherever a straight, same-size pipe-to-pipe connection is needed without a change in direction or diameter.

Key Features

• 1-1/4 inch nominal pipe size for standard black iron pipe connections
• Black finish suitable for gas and non-potable piping applications
• Merchant coupling style provides straight, same-size pipe-to-pipe jointing
• Sold in a package quantity of 16 units per pack
• Threaded ends compatible with standard NPT pipe threading

Compatibility

Designed as an OEM-style replacement and standard-stock fitting for 1-1/4 inch nominal black iron pipe systems in gas distribution, mechanical, and industrial piping installations.

Installation Notes

Installation is performed by licensed plumbers, pipefitters, or gas fitters in accordance with applicable code requirements such as the IFGC or IPC. Shut off and depressurize the gas or fluid system completely before disassembling or installing any threaded fitting. Apply an appropriate pipe thread sealant or PTFE tape rated for the service medium to all male threads before assembly. Do not overtighten threaded connections; hand-tighten and then use a pipe wrench for final make-up.