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The MUELLER STREAMLINE 584-000p66 is a 66-piece assortment of 3/4 inch black steel nipple fittings designed for use in plumbing, OEM fabrication, oil, gas, and steam systems. Each nipple is manufactured from welded steel conforming to ASTM A733/A53 and carries Schedule 40 standard wall thickness. Connections are male threaded on both ends, conforming to ANSI/ASME B1.20.1 thread standards. The black finish provides a base-level rust-resistant surface treatment suited for dry or low-moisture industrial and mechanical environments. The full set weighs 20.075 pounds and is packaged as a single inner pack of 66 fittings.
This fitting kit is appropriate for residential and light commercial plumbing rough-in, industrial piping assemblies, OEM equipment builds, and gas distribution lines. The range of nipple lengths included in the assortment supports multiple configuration needs in a single purchase. Plumbers, pipefitters, and mechanical contractors working on natural gas, steam, or water supply systems will find this kit useful for stocking a service van or supplying a job site. The black steel finish is standard for gas piping applications in many jurisdictions.
Designed as OEM-style replacement and general-use fittings for 3/4 inch black steel pipe systems in plumbing, gas, oil, and steam service configurations.
Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, including IFGC requirements for gas piping or IPC requirements for plumbing systems. Shut off the gas supply or water service and depressurize the line before removing or installing any threaded fittings. Apply an appropriate thread sealant or PTFE tape rated for the specific service medium before making up threaded connections. Do not overtighten threaded fittings, as this can damage threads or cause stress cracking in the pipe wall.
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