Bk Mueller 520-174HC 90 Reducing Elbow 1-1/2x3/4 Threaded

Product Description

The BK MUELLER 520-174HC is a 90 degree reducing elbow fitting designed for threaded pipe systems in residential and commercial plumbing and gas distribution applications. Manufactured from malleable iron with a black finish, this fitting transitions from a 1-1/2 inch female iron pipe (FIP) inlet to a 3/4 inch FIP outlet while redirecting flow at a 90 degree angle. Rated at Class 150 with a liquid and gas pressure rating of 300 psi, it handles the demands of both low-pressure gas lines and standard water piping. Licensed plumbers and pipefitters install this type of fitting when a direction change and pipe size reduction are required at the same connection point.

This reducing elbow is suited for threaded black iron pipe systems commonly found in natural gas supply lines, propane distribution, steam heating systems, and general water service piping. The black finish is standard for gas piping installations where coating integrity and corrosion resistance are required by local codes. It is appropriate for use in residential and light commercial systems where Class 150 malleable iron fittings are specified.

Key Features

• 90 degree elbow combines direction change and size reduction in a single fitting
• Malleable iron construction rated to 300 psi liquid and gas pressure
• Female iron pipe (FIP) threads on both ends for standard threaded pipe connections
• Black finish suitable for gas line applications per common code requirements
• Class 150 rated for residential and light commercial service

Compatibility

Designed as an OEM-style replacement and standard fitting for Class 150 threaded malleable iron pipe systems using 1-1/2 inch to 3/4 inch black iron pipe.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing and mechanical codes, including IFGC requirements for gas line work. Shut off and depressurize the supply line completely before disassembling or threading any fitting. Apply an approved thread sealant or PTFE tape rated for the service medium before making up the threaded connections. Do not over-tighten; use a pipe wrench with a backup wrench on adjacent fittings to avoid stressing upstream joints.