Bk Mueller 520-157HC 90 Reducing Elbow 1-1/2x1 in Threaded

Product Description

The BK MUELLER 520-157HC is a black malleable iron 90 degree reducing elbow designed for threaded pipe installations in gas, air, and liquid distribution systems. It transitions from a 1-1/2 inch line down to a 1 inch outlet, making it a practical choice when a system requires both a direction change and a reduction in pipe diameter at the same junction. Rated Class 150 with a 300 psi pressure rating, this fitting handles the demands of commercial and residential mechanical systems. Female Iron Pipe (FIP) threads on both ends accept standard NPT pipe. Licensed plumbers and pipefitters are the primary installers.

This reducing elbow is used in residential and light commercial piping systems for natural gas, propane, compressed air, and water distribution. Its black finish identifies it as a standard black iron fitting suited to gas piping applications, while the malleable iron construction provides the ductility needed to resist mechanical stress in threaded assemblies. A single fitting handles both the 90 degree turn and the pipe size reduction, eliminating the need for a separate coupling and elbow in tight spaces.

Key Features

• Reduces from 1-1/2 inch to 1 inch in a single 90 degree fitting
• Malleable iron construction resists cracking and mechanical stress at threaded joints
• 300 psi pressure rating, Class 150 classification
• Female Iron Pipe (FIP) threaded connections on both ends, NPT compatible
• Black finish suitable for gas piping identification

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard NPT threaded pipe systems in Class 150 black iron piping assemblies.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, IFGC requirements for gas piping, and IPC requirements for water systems. Shut off and depressurize the line completely before disassembling any threaded connections. Apply an approved thread sealant or PTFE tape rated for the intended service fluid before making up the joint. Do not over-tighten malleable iron fittings, as excessive force can crack the casting.