B K Mueller 584-040HN Black Pipe Nipple 3/4x4

Product Description

The B K Mueller Industries 584-040HN is a black steel pipe nipple sized at 3/4 inch diameter by 4 inches in length. Pipe nipples are short threaded pipe sections used to connect two female-threaded fittings, valves, or other piping components. This nipple is finished in black, indicating it is made from black steel rather than galvanized material, making it well suited for gas distribution, steam, and general-purpose piping applications. Installation is performed by licensed plumbers, pipefitters, and HVAC technicians working on low-pressure gas lines, hydronic heating systems, or industrial piping assemblies.

This nipple is commonly used in residential and light commercial piping systems where a short, rigid connection is needed between threaded fittings. Typical applications include natural gas supply lines, propane distribution, steam heating systems, and compressed air distribution. The 4-inch length suits close-quarter connections where a longer pipe section is not required. It is sold in packages of 15 units, making it practical for contractors stocking van inventory or completing multi-point installations.

Key Features

• Black steel construction suited for gas, steam, and general-purpose piping
• 3/4 inch nominal pipe diameter with standard NPT threading
• 4 inch overall length for short-reach threaded connections
• Sold in a package quantity of 15 units
• Non-galvanized finish appropriate for fuel gas applications per standard piping codes

Compatibility

Designed as an OEM-style replacement or standard-use component compatible with 3/4 inch NPT threaded fittings, valves, and couplings used in gas, steam, and general-purpose black iron piping systems.

Installation Notes

Black pipe nipples should be installed by a licensed plumber, pipefitter, or HVAC technician following local plumbing and mechanical codes, including IFGC requirements for gas piping. Shut off and bleed the gas supply or isolate the piping system before making any threaded connections. Apply listed pipe thread sealant or PTFE tape rated for gas service to all threaded joints before assembly. Do not over-tighten threaded connections, as this can crack fittings or distort threads.