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The NDL INDUSTRIES W4043 is a copper reducing tee designed for sweat-connection copper tubing systems. It features a run size of 7/8 inches with a 5/8-inch branch and a 5/8-inch outlet, all joined via solder-cup (C x C x C) connections. This fitting is used to split or reduce flow within a copper line set, chilled water loop, or hydronic distribution system. Licensed plumbers and HVAC technicians install this type of fitting where a main line must feed a reduced branch line without adapters or transitions.
This reducing tee suits residential and light commercial applications where copper tubing transitions from a larger main to smaller branch lines. Typical installations include domestic hot and cold water distribution, hydronic heating piping, and refrigeration or HVAC line set work. The C x C x C configuration means all three ports accept copper tubing and are joined using standard solder or brazing techniques.
Designed as an OEM-style replacement or new-installation fitting for copper tubing systems requiring a reducing tee at 7/8-inch by 5/8-inch by 5/8-inch dimensions with solder-cup connections.
Installation should be performed by a licensed plumber or qualified HVAC technician following applicable local plumbing codes and IFGC or IPC requirements where relevant. Shut off and depressurize the water or refrigerant system and allow all lines to cool completely before cutting into existing copper pipe. Clean and flux all mating surfaces thoroughly before applying heat to ensure a sound solder or braze joint. Do not overheat the fitting, as excessive heat can damage the fitting geometry or contaminate the internal surface.
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