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The NDL INDUSTRIES W4005 is a copper reducing tee fitting designed to split or combine flow in a copper tubing system while transitioning between two different pipe sizes. With a C x C x C (sweat) connection type and a 3/8 x 3/8 x 1/2 inch configuration, this tee accepts solder connections on all three ports. The run measures 3/8 inch on both ends, and the branch outlet steps up to 1/2 inch, making it suited for applications where a larger supply feeds into or draws from a smaller distribution line. Plumbers and HVAC technicians rely on this type of fitting for clean, leak-free brazed or soldered joints in both hot and cold water and refrigerant piping systems.
This reducing tee is used in residential and light commercial copper piping installations where a branch connection requires a size transition. Typical applications include domestic hot and cold water distribution, hydronic heating systems, and refrigerant line sets where a 1/2 inch main line must tee off to 3/8 inch branch runs. The sweat connection style requires standard copper tube preparation and solder or brazing filler material appropriate to the service application.
Designed as an OEM-style replacement or new-installation fitting compatible with standard 3/8 inch and 1/2 inch copper tubing used in residential and light commercial plumbing and HVAC piping systems.
Installation should be performed by a licensed plumber or HVAC technician in accordance with applicable local plumbing codes and IFGC or IPC guidelines where relevant. Shut off and depressurize the supply line fully before cutting into existing piping. Clean all tube ends and fitting sockets with emery cloth or a tube cleaning brush, apply flux, and solder or braze per the filler material manufacturer specifications and the service requirements of the system. Avoid overheating the fitting, which can damage the socket and result in a failed joint.
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