B K Mueller 520-004HN 3/4 in Black 90 Degree Elbow 25 Pack

Product Description

The B K Mueller Industries 520-004HN is a 3/4 inch black malleable iron 90 degree equal elbow designed for threaded pipe systems in gas, plumbing, and mechanical applications. This fitting changes pipe direction by 90 degrees while maintaining a consistent bore size on both ends, making it a standard component in low-pressure gas distribution, compressed air lines, and black iron pipe assemblies. It ships in a package quantity of 25 units, suited for contractor restocking or multi-point installations. Licensed plumbers and pipefitters handle this fitting as part of routine black iron system builds and service work.

This elbow is used in residential and light commercial piping systems where black iron threaded fittings are specified. Common applications include natural gas supply lines, propane distribution, and compressed air headers. The 3/4 inch size fits standard Schedule 40 black iron pipe and accepts NPT threaded connections. It is a practical stock item for plumbing and mechanical contractors who regularly work with black iron pipe systems.

Key Features

• 90 degree change of direction with equal 3/4 inch end sizing on both ports
• Black iron finish suitable for gas and mechanical piping applications
• Threaded NPT connections for standard black iron pipe assembly
• Sold in a package of 25 units for contractor-quantity use
• Equal elbow design maintains consistent flow path diameter through the turn

Compatibility

Designed as an OEM-style replacement and standard-stock fitting compatible with 3/4 inch Schedule 40 black iron threaded pipe systems using NPT connections.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable code requirements such as the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC). Shut off and depressurize the gas or fluid supply before threading or removing any fitting. Apply an approved thread sealant or pipe tape rated for the intended service medium before making up connections. Do not over-tighten threaded joints, as this can crack the fitting body.