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The NDL INDUSTRIES W1029 is a copper reducing coupling designed to transition between two different tube sizes in a soldered copper piping system. It connects 3/4-inch copper tubing to 5/8-inch copper tubing using a standard sweat (C x C) connection on both ends. This fitting is used in potable water, hydronic heating, and refrigeration line applications where a diameter reduction is needed without introducing a threaded or press-fit junction. Licensed plumbers and HVAC technicians install this fitting as part of new construction or retrofit work on copper distribution and process piping systems.
The W1029 reducing coupling suits residential and light commercial plumbing and mechanical systems where copper tube runs require a step-down from 3/4-inch to 5/8-inch. Typical installation scenarios include domestic hot and cold water supply lines, hydronic loop branch takeoffs, and refrigerant line modifications requiring a copper sweat reduction. This fitting ships in a box quantity of 100 units, making it appropriate for contractors stocking jobsite supplies or wholesale replenishment.
Designed as an OEM-style replacement or new-installation fitting for copper piping systems using standard 3/4-inch and 5/8-inch outside-diameter tube with C x C sweat connections.
Installation should be performed by a licensed plumber or qualified mechanical contractor in accordance with the International Plumbing Code (IPC) and applicable local codes. Shut off the water supply and fully drain the line before cutting or fitting copper tube. Clean and flux both tube ends and the fitting sockets before soldering; use lead-free solder for any potable water application. Allow the joint to cool completely before restoring system pressure.
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