B K Mueller 521-353HN Black Reducing Coupling 1x1/2 in

Product Description

The B K Mueller Industries 521-353HN is a black reducing coupling designed to connect pipes of two different diameters in a piping system. Sized at 1 inch by 1/2 inch, this coupling transitions flow from a larger pipe to a smaller one, making it a practical fitting for residential and light commercial plumbing applications. The black finish indicates a standard black malleable iron or black pipe fitting construction, commonly used in gas piping, fire suppression, and industrial plumbing installations. Sold in a package of 5 units, it suits jobs requiring multiple fittings in a single run.

This reducing coupling is suited for threaded pipe systems where a reduction in pipe size is needed along a run. It is commonly installed in gas distribution lines, compressed air systems, and water piping where black iron fittings are specified. Licensed plumbers and pipefitters typically install this type of fitting in both new construction and retrofit work.

Key Features

• Reduces from 1 inch to 1/2 inch pipe diameter in a single threaded fitting
• Black finish suitable for gas, air, and industrial piping systems
• Sold in a package of 5 units for multi-fitting jobs
• Threaded connection type for standard pipe assembly
• Compact coupling form factor fits tight piping layouts

Compatibility

Designed as an OEM-style replacement or standard fitting for threaded pipe systems requiring a 1 inch to 1/2 inch reduction in black iron or compatible pipe materials.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, the International Plumbing Code, or the International Fuel Gas Code where gas service is involved. Shut off gas or water supply and depressurize the line before disassembly or fitting installation. Apply appropriate thread sealant or PTFE tape to all threaded connections. Do not overtighten threaded fittings, as this can crack or deform the fitting body.