Bk Mueller 584-090HN Black Pipe Nipple 3/4 in 9 in Sch 40

Product Description

The BK MUELLER 584-090HN is a Schedule 40 black steel pipe nipple used to create threaded pipe connections in gas, water, and general plumbing systems. Measuring 3/4 inch in diameter and 9 inches in length, this nipple features standard 3/4-inch NPT threads on both ends and a black finish coating applied over the steel body. It is installed by licensed plumbers, pipefitters, and HVAC technicians working on low-pressure piping assemblies, gas distribution lines, and mechanical systems that require a close-coupled threaded connection between fittings or valves.

This nipple is suited for residential and light commercial applications including natural gas and propane supply lines, steam and water distribution piping, and industrial plumbing assemblies. The 9-inch length provides enough reach to span short gaps between fittings without requiring a union or additional coupling. The black oxide finish is standard for gas piping applications and is widely accepted under mechanical and fuel-gas codes.

Key Features

• Schedule 40 wall thickness rated for standard low-pressure piping service
• 3/4-inch NPT threads on both ends for direct connection to compatible fittings and valves
• Black finish coating - standard for gas line piping per IFGC requirements
• Steel construction for strength and durability in mechanical piping systems
• 9-inch body length suits close-coupled and moderate-reach installations

Compatibility

Designed as an OEM-style replacement and standard-stock threaded nipple for 3/4-inch Schedule 40 black steel piping systems using NPT fittings.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC and IFGC codes. Shut off and depressurize the line before disassembling any threaded connections. Apply an appropriate thread sealant or PTFE tape rated for the intended service medium before making up the joint. Do not over-tighten threaded connections, as this can crack cast fittings or distort valve bodies.