B K/mueller Inds(import) 521-343HN Black Reducing Coupling

Product Description

The B K/MUELLER INDS(IMPORT) 521-343HN is a black reducing coupling designed to connect pipe runs where a transition from a larger diameter to a smaller diameter is required. This fitting accepts a 3/4-inch inlet and reduces to a 1/2-inch outlet, making it a standard component in black iron pipe assemblies used for gas distribution and related piping systems. The fitting is supplied in a package quantity of 15 units, making it practical for service contractors and wholesale trade buyers who work multiple jobs at a time. Licensed plumbers and gas fitters are the primary installers for this type of fitting.

This reducing coupling is suited for residential and light commercial applications where black iron pipe is the specified material. Common install scenarios include natural gas supply lines, propane distribution systems, and similar piping configurations where threaded black iron fittings are code-required or preferred. The 3/4-inch by 1/2-inch size is one of the most frequently encountered reducing combinations in residential gas rough-in work.

Key Features

• Reduces from 3/4 inch to 1/2 inch for common pipe transition needs
• Black iron construction suited for gas piping applications
• Threaded fitting for standard black iron pipe assembly
• Sold in a package of 15 units for multi-job efficiency

Compatibility

Designed as an OEM-style replacement and standard-stock fitting compatible with 3/4-inch by 1/2-inch threaded black iron pipe systems.

Installation Notes

This fitting is typically installed by a licensed plumber or gas fitter in accordance with local mechanical and fuel-gas codes, including the IFGC where adopted. Shut off and verify gas supply is at zero pressure before disassembling or assembling threaded gas fittings. Use an approved pipe thread sealant or PTFE tape rated for gas service on all threaded connections. Do not over-tighten; follow applicable code requirements for joint integrity and leak testing after installation.