NIBCO Sweat Fitting Adapter: 3/8 in CTS x 1/2 in Pipe, Cup x FNPT

A NIBCO sweat fitting adapter connects copper tubing to threaded pipe in plumbing and HVAC systems. The 3/8 in CTS cup end solders onto tubing, while the 1/2 in FNPT end accepts male threaded pipe, enabling reliable transitions in potable water, hydronic heating, and industrial fluid lines.

The NIBCO 603R is a wrot copper sweat fitting adapter with a 3/8 in CTS cup x 1/2 in FNPT configuration. It is designed for soldered connections on the cup end and threaded connections on the pipe end, suitable for use in plumbing and mechanical systems requiring durable, corrosion-resistant joints.

3G Electric supplies NIBCO sweat fitting adapters worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner across 14 industrial departments, we provide genuine NIBCO fittings like the 603R 3/8x1/2 to support plumbing, HVAC, and industrial projects anywhere.

To install a NIBCO sweat fitting adapter, clean and flux the copper tube and cup end, then heat evenly with a torch until solder flows into the joint. For the FNPT end, apply thread sealant and tighten onto male pipe. Follow standard soldering practices for wrot copper fittings to ensure leak-free connections.