B K/mueller 520-434HN Black Double Reducing Tee 3/4x1/2x3/4

Product Description

The B K/Mueller Industries 520-434HN is a black double reducing tee designed for threaded pipe assemblies in gas distribution and similar piping systems. This fitting transitions from a 3/4-inch run on both ends to a 1/2-inch branch outlet, allowing a single fitting to handle two reductions without additional couplings. The black iron finish is standard for gas piping applications. Licensed plumbers and gas fitters install this type of fitting when branching a smaller lateral off a main gas supply line in residential and light commercial settings.

This double reducing tee is used in residential and light commercial gas piping, including natural gas and propane distribution systems where branch lines require a size step-down at the tee. The 3/4-inch by 1/2-inch by 3/4-inch configuration is a common layout for main-run continuation with a reduced branch drop to appliances such as furnaces, water heaters, or ranges. It is sold in packages of 25 units, making it practical for contractors stocking commonly used fitting sizes.

Key Features

• Double reducing configuration: 3/4-inch run by 1/2-inch branch by 3/4-inch run in a single fitting
• Black iron finish suited for gas piping applications per standard trade practice
• Threaded connections for use with standard NPT pipe and fittings
• Sold in a package quantity of 25 for contractor and shop stocking
• Each (EA) unit-of-measure packaging for straightforward inventory management

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard NPT-threaded black iron pipe systems, typically used in residential and light commercial gas distribution piping.

Installation Notes

Installation of gas pipe fittings must be performed by a licensed plumber or gas fitter in accordance with local codes and the International Fuel Gas Code (IFGC). Shut off the gas supply and verify pressure is relieved before cutting into any existing line. Apply an appropriate thread sealant rated for gas service to all male threads before assembly. Pressure-test the completed assembly per local code requirements before returning the system to service.