B K Mueller 520-303HN 1/2 in Black Street Elbow 90 Deg

Product Description

The B K Mueller Industries 520-303HN is a 1/2-inch black malleable iron street elbow configured at 90 degrees. Street elbows differ from standard elbows in that one end is a male (spigot) thread and the other is a female (socket) thread, allowing the fitting to thread directly into another fitting without a nipple. This design reduces overall assembly length and simplifies tight-space installations. The black finish indicates an uncoated iron fitting suited for gas distribution and similar applications. Licensed plumbers and pipefitters are the typical installers for this type of fitting.

This 90-degree street elbow is used in residential and light commercial gas piping systems, including natural gas and propane distribution lines. It is also common in black iron pipe assemblies for compressed air, fire suppression headers, and industrial fluid systems where malleable iron fittings are specified. The compact street configuration makes it well suited for confined spaces where standard elbow-plus-nipple assemblies will not fit. Package quantity is 15 pieces per unit.

Key Features

• 90-degree turn in a single fitting with male spigot on one end and female socket on the other
• 1/2-inch nominal pipe size with NPT threads
• Black finish malleable iron construction for gas and fluid piping
• Street elbow design eliminates need for a close nipple between fittings
• Sold in a package of 15 pieces

Compatibility

Designed as a standard NPT-threaded replacement or new-installation fitting for 1/2-inch black iron pipe systems in residential and commercial gas and fluid piping applications.

Installation Notes

Installation of black iron gas fittings must be performed by a licensed plumber or pipefitter in accordance with the International Fuel Gas Code (IFGC) and applicable local codes. Shut off gas supply at the meter or main valve and verify zero pressure before threading any fitting. Apply an approved pipe thread sealant or PTFE tape rated for gas service to all male threads before assembly. Pressure-test the completed assembly per code before returning the system to service.