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The B K/MUELLER INDS(IMPORT) 520-165HC is a 90-degree black reducing elbow designed for threaded pipe assemblies where a directional change and a reduction in pipe size are needed at the same point. Transitioning from a 1-1/4 inch to a 1 inch connection, this fitting eliminates the need for a separate coupling and elbow in tight runs. The black finish indicates a malleable iron or black steel construction suited for gas distribution, compressed air, and similar non-potable applications. Licensed plumbers and pipefitters typically install this fitting during new construction and retrofit work.
This reducing elbow is used in residential and light commercial piping systems where a 90-degree turn and a step-down in pipe diameter are required in a single fitting. Common applications include natural gas supply lines, propane distribution, and industrial compressed air headers. The fitting is sold in packages of 8, making it practical for contractors stocking up for multiple rough-in installations.
Designed as an OEM-style replacement or standard-stock fitting for threaded black pipe systems using 1-1/4 inch to 1 inch reducing connections in gas, air, or similar non-potable piping assemblies.
Installation is performed by licensed plumbers or pipefitters following applicable local codes and IFGC requirements for gas piping. Shut off the gas supply or depressurize the air system completely before working on any threaded connection. Apply an approved pipe thread sealant or PTFE tape rated for the service medium before threading the fitting. Do not over-tighten; inspect all joints for leaks after pressurizing the system.
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