B K/mueller Inds(import) 521-331HC Black Reducing Coupling

Product Description

The B K/MUELLER INDS(IMPORT) 521-331HC is a black reducing coupling designed to connect pipe segments of two different diameters in threaded piping systems. This fitting transitions from a 1/2-inch connection to a 1/4-inch connection and is finished in black, consistent with black iron pipe fittings commonly used in gas distribution, compressed air, and similar industrial or commercial piping applications. Licensed plumbers and pipefitters install this type of coupling when a line size reduction is required inline without the need for additional adapters. The unit ships in a package quantity of 30.

This reducing coupling is suited for use in residential and commercial piping systems where black iron fittings are specified. Typical installations include natural gas supply lines, propane distribution systems, and compressed air networks. The 1/2-inch by 1/4-inch size reduction makes it a practical choice when transitioning from a main supply run to a smaller branch or appliance connection. It is sold individually, unit of measure each.

Key Features

• Reduces from 1/2 inch to 1/4 inch for inline pipe diameter transitions
• Black finish compatible with standard black iron pipe fittings
• Threaded design for secure, leak-resistant connections
• Available in a package quantity of 30 for multi-job or wholesale purchasing

Compatibility

Designed as an OEM-style replacement or standard-use reducing coupling for threaded black iron piping systems requiring a 1/2-inch to 1/4-inch transition.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, including IFGC requirements for gas piping systems. Shut off the gas or compressed air supply and relieve system pressure before beginning any fitting work. Apply thread sealant or tape rated for the intended service to all male threads before assembly. Do not overtighten; snug the fitting and confirm with a pressure test before returning the system to service.