Bk Mueller 520-154HN 90 Reducing Elbow 1x3/4 in Threaded

Product Description

The BK MUELLER 520-154HN is a black malleable iron 90 degree reducing elbow rated for Class 150 service. It transitions a 1-inch line down to a 3/4-inch line in a right-angle configuration using female iron pipe (FIP) threaded connections on both ends. This fitting handles a liquid and gas pressure rating of 300 psi, making it suitable for natural gas, steam, and water distribution systems. The black finish is standard for gas piping applications. Plumbers and pipefitters install this type of fitting when a run changes direction and reduces pipe size in the same connection point.

This reducing elbow is used in residential and light commercial piping systems where a 90 degree directional change and a pipe size reduction are needed at the same point. Typical applications include gas supply lines, hydronic heating distribution, compressed air, and black iron water systems. The 1 x 3/4 inch size makes it a common choice for branch drops off main supply lines in both new construction and retrofit work.

Key Features

• Malleable iron construction for strength and impact resistance in threaded piping systems
• 300 psi liquid and gas pressure rating supports gas, steam, and water service
• FIP threaded connections on both ends for standard pipe thread assembly
• Black finish suited for gas piping applications per common code requirements
• Class 150 classification consistent with ANSI/ASME B16.3 malleable iron fitting standards
• Combines 90 degree elbow and reducing function in a single fitting

Compatibility

Designed as an OEM-style replacement or new-installation fitting compatible with standard 1-inch x 3/4-inch female iron pipe threaded systems in black iron gas, steam, or water piping assemblies.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, IFGC requirements for gas systems, or IPC requirements for water and steam systems. Shut off and bleed the line before disassembly or installation. Apply an appropriate pipe thread sealant or PTFE tape rated for the service medium before threading the fitting onto the mating pipe. Do not overtighten threaded connections, as malleable iron fittings can crack under excessive torque.