B K Mueller 520-143HN Black Reducing Elbow 3/4x1/2 90 Deg

Product Description

The B K Mueller Industries 520-143HN is a 90-degree black reducing elbow used to change direction in a threaded pipe run while stepping down from a 3/4-inch to a 1/2-inch line. This fitting is a standard malleable iron black pipe fitting suited for gas distribution, compressed air, and similar low-pressure threaded piping systems. It ships in a pack of 10 units, making it a practical choice for jobs that require multiple fittings of the same size. Licensed plumbers, pipefitters, and HVAC technicians install this type of fitting when routing black iron pipe through walls, mechanical rooms, and equipment connections.

The 520-143HN reducing elbow is used in residential and light commercial installations where a threaded black iron piping system requires a directional change combined with a pipe size reduction. Common applications include natural gas and propane branch lines, compressed air headers, and industrial fluid systems where NPT-threaded black iron pipe is the specified material. The pack-of-10 quantity suits service contractors and pipefitters stocking out a job rather than purchasing individual fittings.

Key Features

• 90-degree elbow configuration changes pipe direction while reducing line size in a single fitting
• Reduces from 3/4 inch to 1/2 inch for common branch-line step-downs
• Black iron malleable construction suited for gas and compressed air service
• NPT threaded ends for standard threaded pipe assembly
• Sold in a pack of 10 units per package

Compatibility

Designed as an OEM-style threaded replacement fitting compatible with standard 3/4-inch by 1/2-inch NPT black iron pipe systems used in residential and commercial gas and compressed air piping.

Installation Notes

Installation is performed by a licensed plumber or pipefitter following local code requirements and IFGC guidelines for gas piping or applicable mechanical codes for other services. Shut off and depressurize the pipe system completely before removing or installing any threaded fittings. Apply listed pipe thread sealant or PTFE tape rated for the intended service to all male NPT threads before assembly. Do not overtighten threaded connections; use a pipe wrench to bring the joint to proper engagement without stressing the fitting body.